Patent ID: 6454056
Filing Date: 2002-09-24
Classification: F16D

Abstract:
In a disc brake having a support member secured to a vehicle, a first guide pin located in a first bore and a second guide pin located in a second bore to define first and second bearing surfaces that align a caliper over a rotor associated with a wheel of the vehicle, said caliper having an actuation section connected by a bridge to an arm, said actuation section having an actuation bore therein for retaining a piston to define an actuation chamber, a first friction member connected to said piston and a second friction member connected to said arm, said actuation chamber on being presented pressurized fluid from a source acting on said piston and actuation section to develop a force for moving said first and second friction members into engagement with said rotor to effecting a brake application, said caliper being characterized by a first ear extending from said actuation section and a second ear extending from said arm, said first guide pin being located by said first ear in said first bore and said second guide pin being located by said second ear in said second bore, said first pin having a first bearing length and said second pin having a second bearing length, said first bearing length and said second bearing length being substantially equal when said first and second friction members are new and with changes in thickness of said first and second friction members caused by wear engagement with said rotor said first bearing length of said first pin decreases while said bearing second length of said second pin increases to maintain said a substantially constant cumulative bearing length of engagement between said first and second guide pins and said support member.