Disk brake for a vehicle comprising at least: - a disk brake calliper of the sliding calliper type, comprising two arms, arranged to straddle a sector of a brake disk with one arm on each side of the disk, which calliper is equipped with: ∘ a body comprising at least one piston cylinder, arranged in a part forming an inner arm of the calliper, which cylinder is arranged and configured to receive a brake piston which is mounted sliding and is actuated to press an inner brake pad against an inner face of the brake disk, ∘ a nose firmly fixed to said body by an arch, said nose forming an outer arm of the calliper and receiving in a fixed manner an outer brake pad; - a brake carrier, rotationally fixed with respect to the vehicle and extending on only one side with respect to the plane of the disk brake, said brake carrier comprising at least one pad housing arranged and configured to receive the inner brake pad in a rotationally fixed and axially sliding manner; said brake pads (18, 19) being arranged on both sides of the brake disk so as to be applied against the opposite faces of the disk under the effect of an actuation of the piston and by pressing on an inner face of the nose, and arranged so that: - the inner pad comprises two mounting lugs protruding from two of its ends, each lug being arranged and configured to be mounted in a pad housing of said brake carrier, in axially sliding manner, and to cooperate therewith to receive: ∘ tangential retention, by abutment on a lateral housing surface, and ∘ radial retention, by abutment on a lower housing surface and on an upper housing surface; - the outer pad is held rotationally and translationally fixed by the nose of the calliper; said brake being characterized in that the calliper comprises two guide bores, each bore being arranged and configured to receive in sliding manner a guide pin which is borne in firmly fixed manner by the brake carrier, the calliper being thus translationally mobile on the brake carrier in an axial direction; in that it comprises one or more radial retaining springs, each arranged and configured to cooperate with a lug of the inner pad, said radial retaining spring being linear or lamellar in form and comprising a support arm placed against the lower face of the lug of the pad and a sliding arm curved in form, a convex surface of which comes into sliding contact with the lower face of the housing, said arms being linked to each other so as to move the lower face of the lug apart from the lower face of the housing; and in that it comprises one or more sliding elements comprising a lamellar element complementary in form to the form of the pad housing of the brake carrier, which is placed between a lug of the inner pad and the corresponding pad housing in the brake carrier, and has at least: - a sliding wing which rests against a lower surface of the housing and receives support from the sliding arm of the radial retaining spring to provide the lug with radial retention while allowing it to slide axially, and - a tangential abutment wing, which rests against a lateral surface of the housing and receives support from the lug to provide it with tangential retention during braking. - a disk brake calliper of the sliding calliper type, comprising two arms, arranged to straddle a sector of a brake disk with one arm on each side of the disk, which calliper is equipped with: ∘ a body comprising at least one piston cylinder, arranged in a part forming an inner arm of the calliper, which cylinder is arranged and configured to receive a brake piston which is mounted sliding and is actuated to press an inner brake pad against an inner face of the brake disk, ∘ a nose firmly fixed to said body by an arch, said nose forming an outer arm of the calliper and receiving in a fixed manner an outer brake pad; ∘ a body comprising at least one piston cylinder, arranged in a part forming an inner arm of the calliper, which cylinder is arranged and configured to receive a brake piston which is mounted sliding and is actuated to press an inner brake pad against an inner face of the brake disk, ∘ a nose firmly fixed to said body by an arch, said nose forming an outer arm of the calliper and receiving in a fixed manner an outer brake pad; - a brake carrier, rotationally fixed with respect to the vehicle and extending on only one side with respect to the plane of the disk brake, said brake carrier comprising at least one pad housing arranged and configured to receive the inner brake pad in a rotationally fixed and axially sliding manner; - the inner pad comprises two mounting lugs protruding from two of its ends, each lug being arranged and configured to be mounted in a pad housing of said brake carrier, in axially sliding manner, and to cooperate therewith to receive: ∘ tangential retention, by abutment on a lateral housing surface, and ∘ radial retention, by abutment on a lower housing surface and on an upper housing surface; ∘ tangential retention, by abutment on a lateral housing surface, and ∘ radial retention, by abutment on a lower housing surface and on an upper housing surface; - the outer pad is held rotationally and translationally fixed by the nose of the calliper; - a sliding wing which rests against a lower surface of the housing and receives support from the sliding arm of the radial retaining spring to provide the lug with radial retention while allowing it to slide axially, and - a tangential abutment wing, which rests against a lateral surface of the housing and receives support from the lug to provide it with tangential retention during braking.