Patent ID: 7337881

Claim:
A disc brake comprising: a caliper that straddles a brake disc; a fixed carrier; actuation means comprising a hydraulic path for a selectively operable hydraulic pressure source, a hydraulic cylinder secured to said caliper and closed by a piston, and hydraulic fluid conduits coupling the source to the cylinder; guide means for allowing said caliper to slide relative to the carrier when the actuation means are actuated, said guide means including first and second identical cylindrical guide pins that are parallel to each other and each having a bound end fixed to one of said caliper and said carrier, and a free end; first and second housings at least partially formed by first and second respective bores located in one of said caliper and said carrier and in which the first and second guide pins respectively slide, first and second friction pads located on opposite sides of the disc and retained between the piston and the caliper, said first and second friction pads being applied to the disc when the actuation means are actuated, characterized by an additional pair of hydraulic cylinders, one of which is formed in each of said housings, and a pair of annular hydraulic seals, each disposed within a hydraulic cylinder about one of said guide pins intermediate the free and bound ends thereof to form a hydraulic seal between a guide pin and the sidewall of the corresponding hydraulic cylinder, the hydraulic fluid conduits including a portion for coupling the source with the additional pair of hydraulic cylinders.