Operation CHARM: Car repair manuals for everyone.

Single Piston



Disc Brakes System Description

Single Piston Front Caliper





The front disc brake assembly consists of a caliper assembly, the rotor, and the lining assemblies mounted on the steering knuckle.

Applying the brake pedal causes the hydraulic pressure that moves the caliper piston. The piston then forces the inboard brake lining assembly against the inboard braking surface of the rotor. Increasing the force against the rotor causes the caliper assembly to move inboard. The outer brake lining assembly then contacts the outboard braking surface of the rotor. The force of the two lining assemblies provides the desired clamping action on the rotor.

Releasing the brake pedal relieves the pressure applied on the piston.The square cut seal on the piston relaxes and the seal allows a running clearance between the brake lining assemblies and the rotor.