Patent Description:
In a disc brake of the floating brake caliper type, the brake caliper comprises a support structure or bracket, adapted to be mounted on a fixed portion of the vehicle and generally arranged to straddle the outer peripheral edge of a brake disc, adapted for rotating around a rotation axis (X-X) defining an axial direction (A-A), and a caliper body mounted in a sliding manner on the support structure by means of special guides. The sliding movement (floating) of the brake caliper (in installed condition) is parallel to the rotation axis of the brake disc (XX) along the axial direction (A-A). In addition, in a disc brake a radial direction (R-R) is defined, substantially orthogonal to said axial direction (A-A).

Generally, the caliper body (i. e the floating structure) comprises a lateral portion, arranged externally to the support structure (generally on the hub side of the braking system), and a cantilevered portion, extending from the lateral portion in axial direction (towards the wheel side) on the support structure.

As known, disc brake discs comprise a bell adapted to associate the disc with a hub of a vehicle, from which an annular portion, referred to as a braking band, extends, which is intended to cooperate with brake pads of a caliper.

The brake caliper carries two braking pads, associated in a sliding manner by at least one pin, arranged inside a housing formed in the support structure so that they can come into contact with the braking surfaces of the disc. A first brake pad, or active brake pad, is pushed against the disc directly by thrust means, or pistons, housed in the lateral portion of the caliper body. A second brake pad, or reaction brake pad, opposed to the first brake pad, is pushed against the disc by the cantilevered portion of the caliper body during the sliding of the caliper body with respect to the support structure or bracket following the reaction resulting from the interaction between the first pad and the disc.

Generally, the floating-type brake caliper guides each comprise a guide pin and a guide sleeve configured to be arranged between the caliper body and the bracket.

Usually, the guide pin is fixed to the bracket by means of a coupling portion insertable into a fixing housing made in the bracket, and it comprises a pin sliding portion adapted for sliding inside a sliding housing made in the caliper body and at least partially internally to the guide sleeve.

According to a known embodiment, the coupling portion of the guide pin comprises a screw with an abutment head adapted to abut the caliper body, and a guide pin shank internally comprising a threaded housing adapted to connect with the screw and having a respective abutment head adapted to abut the caliper body on the opposite side with respect to the abutment head of the screw. In this way, by connecting the screw with the pin shank with the respective abutment heads abutting the caliper body, it is possible to make a connection between the guide pin and the caliper body. Solutions of this type are known from <CIT>and <CIT>.

According to a further known embodiment, the coupling portion of the pin is threaded, and the fixing housing of the caliper body is threaded, so as to make a threaded coupling between the guide pin and the caliper body. A solution of this type is illustrated by <CIT>.

According to a known embodiment, the guide sleeve is fixedly connectable from one end to the guide pin and from the other end to the sliding housing, through a first annular lip and a second annular lip, respectively, which project from the sleeve body in radial direction. The first annular lip projects internally radially towards the guide pin and is configured to be received in a pin groove made on the guide pin so as to form an undercut fit between the guide pin and the guide sleeve. The second annular lip projects externally radially towards the bracket and is configured to be received in a bracket groove made in the sliding housing so as to form an undercut fit between the bracket and the guide sleeve. In this way, the guide sleeve, being made of elastomeric material, allows a reversible fit with the guide pin and the bracket, and allows to make a tight fit with the guide pin and with the bracket, protecting on the one hand the guide pin from corrosive phenomena and preventing dust particles, or liquid, of the external environment to come into contact with the guide pin and/or to access the sliding housing.

Although the guides of known type meet the need to protect the guide pin and the sliding housing from solid or liquid particles of the external environment, it was found that the undercut fit between guide pin and guide sleeve makes known-type guides disadvantageous.

According to a disadvantageous aspect, to make a guide pin of known type, a turning step of the guide pin so as to form the groove to fix the guide sleeve to the guide pin is required, thus increasing the production costs of the guide pin.

According to a further disadvantageous aspect, in the maintenance operations for the brake caliper and/or in the assembly and/or replacement operations for known-type guides, the fixing step the guide sleeve to the guide pin is separate from the fixing step the guide pin to the bracket, making it necessary to have expert manual skills of a user and increasing the probability of assembly errors, as well as increasing the time required for maintenance.

Further, in case of advanced wear of the guide sleeve, the undercut connection, although maintaining the connection between guide sleeve and guide pin, could lose its seal and allow liquids to pass through (water) from the outside, favoring the onset of corrosive phenomena for the guide pin compromising the efficiency and operation of the braking system, making frequent visual inspections of the brake caliper necessary to evaluate its functionality.

The need is therefore felt in the sector to realize solutions of floating-type brake caliper guides which involve a reduced number of processing steps, by decreasing production costs and the selling price, and that they are simple to make, while ensuring a tight connection of guide sleeve to the guide pin that is safe and long-lasting, as well as making it possible to simplify and reduce the times of the assembly and maintenance steps for the floating-type brake calipers.

Therefore, the problem underlying the present invention is that of devising a guide pin, as well as a guide sleeve, as well as a guide, as well as a maintenance kit, as well as a brake caliper, which have structural and functional characteristics such as to satisfy the aforementioned needs and to obviate, at the same time, the drawbacks mentioned with reference to the known art and to satisfy the aforementioned felt needs.

The present invention aims to provide a guide for floating type brake calipers that allows a simple, safe and durable connection of a guide pin to a guide sleeve, which allows at the same time to reduce the production costs of the guide itself and simplify the maintenance, assembly or disassembly operations of the brake caliper.

This and other purposes and advantages are achieved with a guide pin according to claim <NUM>, as well as a guide according to claim <NUM>, as well as a maintenance kit according to claim <NUM>, as well as a brake caliper according to claim <NUM>, as well as an assembly method of a brake caliper according to claim <NUM>.

Some advantageous embodiments are the object of the dependent claims.

Thanks to the proposed solutions, it is possible to ensure a coupling between the guide pin and the guide sleeve, avoiding making grooves on the guide pin through turning steps, thus reducing the time required for making the guide pin, as well as production costs.

Thanks to the proposed solutions, it is possible to make a thread coupling between the guide pin and the guide sleeve, which allows a simple and safe connection between the two guiding components, reducing the possibility of incorrect coupling with respect to known solutions, as well as simplifying the assembly and disassembly steps of the guide placed between the bracket and the caliper body of the brake caliper.

Thanks to the proposed solutions, it is possible to provide a guide for floating calipers, with superior protection of the guide pin compared to known solutions. Indeed, thanks to the thread coupling between the guide pin and the guide sleeve, it is possible to have a first sealing portion, as well as thanks to the realization of sealing lips made on the sleeve, it is possible to make a safe seal with the bracket and with a sealing surface of pin downstream of the thread that connects the guide pin to the guide sleeve.

Thanks to the proposed solutions, the coupling between the guide pin and the guide sleeve occurs at least partially concurrently with the coupling between the guide pin and the bracket or the caliper body, in a same step.

Additional features and advantages of the guide pin, as well as of guide sleeve, as well as of the guide, as well as of the brake caliper will appear from the following description of their preferred embodiment examples, given for indicative and non-limiting purposes, with reference to the attached figures in which:.

In accordance with a general embodiment, reference number <NUM> indicates a guide pin for a brake caliper <NUM> of the floating type, in which said brake caliper <NUM> comprises a caliper body <NUM> and a bracket <NUM>, mechanically connectable in sliding relationship.

Said guide pin <NUM> is configured to be placed between said caliper body <NUM> and said bracket <NUM> to allow a relative sliding between the caliper body <NUM> and the bracket <NUM> along an axial direction A-A.

Said guide pin <NUM> is configured to connect to a guide sleeve <NUM> and slide at least partially within said guide sleeve <NUM>.

Said guide pin <NUM> comprises at least a first pin coupling portion <NUM>, a second pin coupling portion <NUM>, and a pin sliding portion <NUM>. Said first pin coupling portion <NUM> is arranged between said second pin coupling portion <NUM> and said pin sliding portion <NUM>.

Said first pin coupling portion <NUM> is configured to couple said guide pin <NUM> to said guide sleeve <NUM>.

Said pin sliding portion <NUM> is configured to guide in a sliding manner said guide pin <NUM> in a sliding housing <NUM> formed in said caliper body <NUM> or said bracket <NUM>.

Said second pin coupling portion <NUM> is configured to couple said guide pin <NUM> to either said bracket <NUM> or said caliper body <NUM>.

Advantageously, said first pin coupling portion <NUM> is threaded to form a threaded coupling between said guide pin <NUM> and said guide sleeve <NUM>.

Thanks to the provision of the threaded first pin coupling portion it is possible to allow a simple, quick and safe connection between the guide pin and the guide sleeve.

Thanks to the provision of the threaded first pin coupling portion, it is possible to make the guide pin without providing an annular groove in the pin body to make an undercut coupling with a coupling lip of the guide sleeve.

In accordance with an embodiment, said guide pin <NUM> comprises a pin sealing portion <NUM> configured to tightly connect with said guide sleeve <NUM>. In accordance with an embodiment, said pin sealing portion <NUM> is a smooth and scratch-free portion, in which said pin sealing portion <NUM> is placed between said first pin coupling portion <NUM> and said pin sliding portion <NUM>. In this way, it is possible to realize a tight connection insulating the threaded first pin coupling portion from the pin sliding portion.

In accordance with an embodiment, said guide pin <NUM> is configured to be inserted into a fixing housing <NUM> made in said bracket <NUM> or in said caliper body <NUM>. In accordance with an embodiment, said fixing housing <NUM> is coaxial and opposite to said sliding housing <NUM>.

In the solutions shown, said fixing housing <NUM> being a housing passing through a thickness of the caliper body <NUM>, and said sliding housing <NUM> being blind housing formed in the bracket <NUM>.

In accordance with an embodiment, said second pin coupling portion <NUM> is threaded to form a threaded coupling with a threaded portion of said fixing housing <NUM>.

In accordance with an embodiment, said first pin coupling portion <NUM> and said second pin coupling portion <NUM> form a seamless pin threaded portion.

In accordance with an embodiment, when said guide pin <NUM> is coupled to said caliper body <NUM> with said second coupling portion <NUM>, said first coupling portion <NUM> is external to said coupling housing <NUM>.

In accordance with an embodiment, said guide pin <NUM> is configured to couple to said guide sleeve <NUM> avoiding realizing on said guide pin <NUM> grooves to connect said guide pin <NUM> to said guide sleeve <NUM> in an undercut manner.

In accordance with an embodiment, said guide pin <NUM> develops along a pin axis parallel to said axial direction A-A.

In accordance with an embodiment, said guide pin <NUM> is axially symmetrical with respect to said pin axis.

In accordance with an embodiment, said guide pin <NUM> is symmetrical with respect to at least one symmetry plane passing through said pin axis.

In accordance with an embodiment, said guide pin <NUM> comprises a pin head <NUM> configured to abut said caliper body <NUM> or said bracket <NUM> when said second pin coupling portion <NUM> is fully coupled to said caliper body <NUM> or said bracket <NUM>. In accordance with an embodiment, said guide pin <NUM> comprises a pin tip <NUM>, diametrically opposite to said pin head <NUM>.

In accordance with an embodiment, said first coupling portion <NUM> and said second pin coupling portion <NUM> substantially have the same diameter, in which said pin sliding portion <NUM> is tapered compared to the first coupling portion <NUM>. In accordance with an embodiment, said pin sliding portion <NUM> is stepped tapered with respect to said sliding portion <NUM> and/or with respect to said pin sealing portion. In accordance with an embodiment, said sliding portion <NUM> is substantially cylindrical and is jointed to said first pin coupling portion <NUM> or to said pin sealing portion with a pin tapered portion. In accordance with an embodiment, said pin sliding portion <NUM> has a second pin diameter D2, smaller than said first pin diameter D3.

In accordance with an embodiment, said pin tapered portion is a truncated cone portion so that said first sleeve coupling portion gradually widens until it takes the diameter of the first pin coupling portion.

In accordance with an embodiment, said pin sliding portion <NUM> comprises at least one longitudinal groove <NUM> which extends from said pin tip <NUM> towards said first pin coupling portion <NUM>, allowing air to be vented from the sliding housing <NUM> during an assembly operation of the brake caliper <NUM>.

In accordance with an embodiment, said pin sliding portion <NUM> is a cylindrical portion of pin and said at least one groove forms recessed flat surfaces in said pin cylindrical portion.

In accordance with an embodiment, said at least one axial groove <NUM> comprises angularly offset axial grooves <NUM> in odd number.

In accordance with an embodiment, said at least one axial groove <NUM> comprises three axial grooves <NUM>, each one offset by an angle of <NUM>°, +- <NUM>°.

In accordance with an embodiment, said pin sliding portion <NUM> has an pin annular housing, delimited by at least said pin tip. In accordance with an embodiment, said pin annular housing is configured to house a damping anti-shock bushing <NUM>.

In accordance with an embodiment, said bushing is made of elastomeric material and comprises a plurality of axial recesses <NUM> adapted to retain a lubricant to allow a low friction sliding of the guide pin <NUM> in the sliding housing <NUM>, and to reduce the contact surface between the guide pin <NUM> and the walls of the sliding housing <NUM>.

In accordance with an embodiment, said guide pin <NUM> is made of steel.

In accordance with an embodiment, said guide pin <NUM> is made in one piece by molding. In accordance with an embodiment, said pin head <NUM> is made in one piece with said first pin coupling portion <NUM>. In accordance with an embodiment, said guide pin <NUM> has no internal threaded holes.

The present invention also relates to a guide sleeve <NUM> for a floating caliper <NUM> of a disc brake. Said guide sleeve <NUM> is configured to couple to a guide pin <NUM> according to any one of the previously described embodiments.

Said guide sleeve <NUM> is configured to be placed between said caliper body <NUM> and said bracket <NUM>.

Said guide sleeve <NUM> comprises a tubular sleeve body <NUM> configured to at least partially accommodate in a sliding manner a pin sliding portion <NUM> of a guide pin <NUM> guided in a sliding manner within a sliding housing <NUM> formed in said bracket <NUM> or in said caliper body <NUM> to allow a relative sliding between said caliper body <NUM> and said bracket <NUM> along an axial direction A-A. In accordance with an embodiment, said guide sleeve has a central hole passing along the axial direction A-A.

Said guide sleeve <NUM> is configured to deform to allow, without interfering, the relative sliding between the caliper body <NUM> and the bracket <NUM>.

Said guide sleeve <NUM> comprises at least a first sleeve coupling portion <NUM>, a sleeve sliding portion <NUM>, a second sleeve coupling portion <NUM>.

Said first sleeve coupling portion <NUM> is configured to connect said guide sleeve <NUM> to said guide pin <NUM>.

Said sleeve sliding portion <NUM> is configured to internally receive at least one portion of said pin sliding portion <NUM>.

Said second sleeve coupling portion <NUM> configured to be inserted into said sliding housing <NUM> and couple said guide sleeve <NUM> to said caliper body <NUM> or said bracket <NUM>. Said sleeve sliding portion <NUM> comprising said second sleeve coupling portion <NUM>.

Advantageously, said first sleeve coupling portion <NUM> is threaded to form a threaded coupling between said guide sleeve <NUM> and said guide pin <NUM>.

In accordance with an embodiment, said guide sleeve <NUM> comprises a first sleeve sealing portion <NUM> which projects radially internally along a radial direction R-R perpendicular to said axial direction A-A towards said guide pin <NUM> so as to seal with a pin sealing portion <NUM> of said pin comprising a smooth, scratch-free surface. In accordance with an embodiment, said first sleeve sealing portion <NUM> is annular.

In accordance with an embodiment, said sleeve sliding portion <NUM> comprises a sleeve central portion <NUM> elastically reversible between an extended configuration and a retracted configuration.

In accordance with an embodiment, said sleeve central portion <NUM> is arranged between said first sleeve coupling portion <NUM> and said second sleeve coupling portion <NUM>.

In accordance with an embodiment, said sleeve central portion <NUM> is adapted for allowing contactless sliding of said pin sliding portion <NUM> both in said retracted configuration and in said extended configuration.

In accordance with an embodiment, said sleeve body <NUM> extends between a first axial sleeve edge <NUM> and a second axial sleeve edge <NUM>, wherein said first axial sleeve edge <NUM> defines said sleeve body <NUM> on the opposite side with respect to said second sleeve coupling portion <NUM>.

In accordance with an embodiment, said guide sleeve <NUM> comprises a second sleeve sealing portion which projects in axial direction A-A from said first axial sleeve edge <NUM> to make a seal with the caliper body <NUM> or with the bracket <NUM> so as to protect said guide pin <NUM> from corrosive phenomena.

In accordance with an embodiment, said sleeve sliding portion <NUM> comprises a sleeve contact portion <NUM> which develops internally with respect to said second sleeve coupling portion <NUM> and configured to contact in a sliding relationship said pin sliding portion <NUM>.

In accordance with an embodiment, said sleeve contact portion <NUM> has a plurality of sleeve axial grooves <NUM> so as to reduce the contact area between said guide sleeve <NUM> and said guide pin <NUM> and so as to create air evacuation channels between the pin sliding portion <NUM> and the sleeve contact portion <NUM> which allow to evacuate air from the sliding housing <NUM>. In accordance with an embodiment, said contact portion has a second sleeve diameter D4, in which said second sleeve diameter D4 is substantially equal to said second pin diameter D2.

In accordance with an embodiment, said guide sleeve <NUM> is made of an elastomeric material compatible with a brake fluid and/or with a lubricant for the guide components, e.g. grease.

In accordance with an embodiment, said elastomeric material comprises rubber. In accordance with an embodiment, said rubber is EPFM rubber or a silicone material.

In accordance with an embodiment, said second sleeve coupling portion <NUM> protrudes radially outwardly from said sleeve body <NUM> to form an undercut connection with an annular fixing groove <NUM>, made radially within said sliding housing <NUM>.

In accordance with an embodiment, said first sleeve sealing portion <NUM> comprises a sleeve sealing tooth <NUM> that forms a first gasket integrated into said sleeve body <NUM>. In accordance with an embodiment, said first gasket is an o-ring or a v-ring.

In accordance with an embodiment, said first axial sleeve edge <NUM> is an annular edge substantially perpendicular to said axial direction A-A. Said second sleeve sealing portion <NUM> comprises a sleeve sealing lip <NUM> that projects from said first axial sleeve edge <NUM> in axial direction A-A thus forming a cusp.

In accordance with an embodiment, said second sleeve sealing portion <NUM> forms a second gasket integrated into said sleeve body <NUM>. In accordance with an embodiment, said sleeve sealing lip <NUM> is annular. In accordance with an embodiment, said second integrated gasket is a v-ring.

In accordance with an embodiment, said second sleeve coupling portion <NUM> is axially delimited by said second axial sleeve edge <NUM>.

In accordance with an embodiment, said second sleeve coupling portion <NUM> comprises a sleeve fixing tooth <NUM> that develops mainly long said radial direction R-R with respect to a sleeve cylindrical portion <NUM> having parallel development with respect to said axial direction A-A.

In accordance with an embodiment, in a section passing through a plane comprising said axial direction A-A and a radial direction R-R perpendicular to it, said sleeve fixing tooth <NUM> forms in a root portion <NUM> an acute angle alpha with said sleeve cylindrical portion. In accordance with an embodiment, said acute angle alpha is between <NUM> and <NUM> degrees. In accordance with an embodiment, in a section passing through a plane comprising said axial direction A-A and a radial direction R-R perpendicular to it, said sleeve fixing tooth <NUM> comprises a lateral portion <NUM> which develops from said root portion <NUM> with an obtuse angle beta with respect to said axial direction A-A, until reaching a substantially cylindrical apical portion <NUM> with parallel development with respect to said axial direction A-A. According to an embodiment, said obtuse angle beta is comprised between <NUM> and <NUM> degrees.

In accordance with an embodiment, said sleeve fixing tooth <NUM>, through said root portion <NUM> and said lateral portion <NUM> forming a tooth wedge portion, wedges against a respective wedge-shaped portion of the annular fixing groove <NUM> made radially in the sliding housing <NUM> formed in the bracket <NUM>.

In accordance with an embodiment, said second sleeve coupling portion <NUM> comprises a sleeve fixing lip <NUM> that develops mainly along the axial direction A-A, in which said sleeve fixing lip <NUM> in a section with respect to a plane comprising said axial direction and said radial direction is substantially perpendicular to said sleeve fixing tooth <NUM>.

In accordance with an embodiment, said sleeve fixing lip <NUM> is configured to be inserted into an annular housing made on an axially internal surface of said fixing groove <NUM>, so as to form a tight fit of said second sleeve coupling portion <NUM> and said bracket <NUM>. In accordance with an embodiment, said sleeve fixing lip <NUM> is configured to elastically urge said sleeve fixing tooth <NUM> against an opposite axially outer surface of said fixing groove <NUM>, preferably wedge-shaped.

In accordance with an embodiment, said sleeve central portion <NUM> is folded into a bellows. In accordance with an embodiment, said central portion <NUM> comprises at least one bellows fold <NUM> extending into radial direction R-R allowing a reversible elongation of said guide sleeve <NUM> between the retracted configuration and the extended configuration. In accordance with an embodiment, said at least one bellows fold <NUM> comprises two bellows folds.

The present invention also relates to a guide <NUM> for a brake caliper <NUM> of the floating type for a disc brake.

Said guide <NUM> comprises a guide pin <NUM> according to one of the previously described embodiments, and a guide sleeve <NUM> according to one of the previous embodiments described, in which the guide pin <NUM> and the guide sleeve <NUM> are reversibly couplable with a threaded coupling.

In accordance with an embodiment, said first pin coupling portion <NUM> has a first pin diameter D1, and in which said first sleeve coupling portion <NUM> has a first sleeve diameter D3, wherein said first sleeve diameter D3 is smaller than said first pin diameter D1 so that said first sleeve coupling portion <NUM> is elastically biased against said first pin coupling portion <NUM> forming a threaded fit as tight as possible between said guide pin <NUM> and said guide sleeve <NUM>. In accordance with an embodiment, said first pin diameter D1 is an M16 thread diameter. In accordance with an embodiment, said first sleeve diameter D3 is an M14 diameter. In accordance with an embodiment, thanks to the provision of the guide sleeve of elastic material, a threaded connection is possible between the first pin diameter D1 greater than the first sleeve diameter D3, ensuring an elastically tightened threaded coupling.

The present invention also relates to a maintenance kit for a brake caliper <NUM> of the floating type.

Said maintenance kit comprises two guide pins <NUM> according to one of the previously described embodiments, and two guide sleeves <NUM> according to one of the previously described embodiments. In accordance with an embodiment, said two guide pins <NUM> are: a main guide pin comprising said at least one axial pin groove and a secondary guide pin comprising said at least one annular pin housing where said damping anti-shock bushing is housed.

The present invention also relates to a brake caliper <NUM> of the floating type comprising a caliper body <NUM> mechanically connected to a bracket <NUM> in a sliding manner by means of at least one guide <NUM> according to any one of the previously described embodiments, in which said at least one guide <NUM> is interposed between said caliper body <NUM> and said bracket <NUM>.

In accordance with an embodiment, at least one sliding housing <NUM> is formed in said bracket <NUM>, so that said guide pin <NUM> is sliding in said bracket <NUM>. In accordance with an embodiment, at least one fixing housing is formed in said caliper body <NUM>, so that said guide pin <NUM> is couplable to said caliper body <NUM>. In accordance with an embodiment, said fixing housing is threaded to connect by a threaded connection with said second pin coupling portion. In accordance with an embodiment, said guide sleeve is coupled to said sliding housing, in particular in an annular fixing housing in which said second sleeve coupling portion is inserted. In accordance with an embodiment, said annular fixing housing has, in a section along a plane comprising said axial direction A-A and a radial direction R-R perpendicular to it, a complementary profile with respect to said second sleeve coupling portion <NUM>, as previously described.

In accordance with an embodiment, said bracket <NUM> is adapted to be mounted on a fixed portion of a vehicle. In accordance with an embodiment said brake caliper <NUM> comprises a first pad and a second pad housed in respective housings formed on said bracket.

The present invention also relates to an assembly method for a brake caliper <NUM> of the floating type.

Claim 1:
A guide pin (<NUM>) for a brake caliper (<NUM>) of the floating type of a disc brake, wherein said brake caliper (<NUM>) comprises a caliper body (<NUM>) and a bracket (<NUM>), wherein said guide pin (<NUM>) is configured to be arranged between said caliper body (<NUM>) and said bracket (<NUM>) to allow the relative sliding between said caliper body (<NUM>) and said bracket (<NUM>) along an axial direction (A-A), and wherein said guide pin (<NUM>) is configured to connect to a guide sleeve (<NUM>) and slide at least partially within said guide sleeve (<NUM>), wherein said guide pin (<NUM>) comprises:
- a first pin coupling portion (<NUM>) configured to couple said guide pin (<NUM>) to said guide sleeve (<NUM>);
- a pin sliding portion (<NUM>) configured to guide in a sliding manner said guide pin (<NUM>) into a sliding housing (<NUM>) obtained in either said caliper body (<NUM>) or said bracket (<NUM>);
- a second pin coupling portion (<NUM>) configured to couple said guide pin (<NUM>) to either said bracket (<NUM>) or said caliper body (<NUM>), wherein said first pin coupling portion (<NUM>) is arranged between said second pin coupling portion (<NUM>) and said pin sliding portion (<NUM>),
characterized in that
said first pin coupling portion (<NUM>) is threaded to form a threaded coupling between said guide pin (<NUM>) and said guide sleeve (<NUM>),
and wherein said guide pin (<NUM>) is configured to couple with said guide sleeve (<NUM>) avoiding making grooves on said guide pin (<NUM>) to connect said guide pin (<NUM>) with said guide sleeve (<NUM>) in an undercut manner.