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A motor vehicle disc brake assembly includes a caliper (12) supporting a pair of friction elements (32,33) to be applied against opposite sides (35,37) of a rotor (14). The caliper (12) forms a cylinder bore (18) in which a brake piston apparatus (40) is slidably mounted to be actuated by hydraulic

A motor vehicle disc brake assembly includes a caliper (12) supporting a pair of friction elements (32,33) to be applied against opposite sides (35,37) of a rotor (14). The caliper (12) forms a cylinder bore (18) in which a brake piston apparatus (40) is slidably mounted to be actuated by hydraulic or other fluid pressure from a master cylinder (20). The brake piston apparatus (40) includes a first piston member (46) and a second piston member (60) disposed within the cylinder bore (18) and having a compliant member (82) disposed therebetween. The compliant member (82) substantially isolates the first piston member (46) from vibrations generated by friction element contact with the rotor (14), substantially eliminating operator detectable tactile vibrations.

대표청구항 ▼

A brake piston apparatus for use in a brake caliper of a disc brake assembly in a motor vehicle, said brake piston apparatus comprising: a first piston member slidably disposed within a cylinder bore of said brake caliper, said first piston member having a hydraulic reaction face in communication wi

A brake piston apparatus for use in a brake caliper of a disc brake assembly in a motor vehicle, said brake piston apparatus comprising: a first piston member slidably disposed within a cylinder bore of said brake caliper, said first piston member having a hydraulic reaction face in communication with hydraulic fluid within said brake caliper and a first end opposite said hydraulic reaction face; a second piston member slidably disposed within said cylinder bore having a second end adjacent to said first end of said first piston member and an opposite operating face end opposite said second for urging a friction element against a rotor; and a compliant member positioned between said first end of said first piston member and said second end of said second piston member, said compliant member being adapted to urge said first piston member into a spaced apart relationship with said second piston member, whereby said first piston member and said brake caliper are isolated from vibrations caused by surface variations in said rotor.