Dual Piston

Disc Brakes System Description

Dual Piston Caliper




The front brake caliper has a single or a dual piston. The single piston caliper is used only on RWD pickups. The dual piston caliper is used on 4WD pickups. Two mounting bolts hold the caliper in place. The caliper is mounted on the steering knuckle. The caliper moves laterally on the steering knuckle when the brakes are applied. The caliper is a one-piece casting with the piston bore(s) in the inboard side. A square-cut rubber seal fits in a groove in each piston bore. The square-cut rubber seal provides a hydraulic seal between the piston and the caliper bore.

The front disc brakes use a combination rotor and hub assembly. The rotor and hub are combined on RWD pickups. The rotor is separate from the hub on 4WD pickups.

The rotor turns freely between the linings, until the caliper forces the linings against the rotor. The vented area between the rotor braking surfaces allows for efficient heat dissipation.