Front Disc
This vehicle is equipped with a performance brake system that features heavy duty wheel brake components. The sales code for this system is BR3. Each front disc brake assembly consists of the following:
- Caliper - single-piston, floating type.
- Caliper adapter.
- Shoe and lining assemblies (pads).
- Rotor.
A square-cut rubber piston seal is located in a machined groove in the caliper cylinder bore. This seal provides a hydraulic seal between the piston and the cylinder wall. See Fig 1.
A rubber dust boot is installed in a groove in cylinder bore opening and in a groove in the piston. The boot prevents contamination in the bore area. See Fig 2.
The BR3 caliper is mounted to the caliper adapter using 2 guide pin bolts. These bolts thread into 2 guide pins, slid into the adapter. The pins are lubricated and have boots to seal them in place in the adapter. See Fig 3. The caliper adapter is fastened to the steering knuckle using 2 bolts. See Fig 4.
The machined abutments on the adapter position the brake shoes and caliper. There are 2 brake shoes, sometimes referred to as pads, per disc brake. One shoe is placed on each side of the brake rotor. The 2 abutment shims (upper and lower) ride between the shoes and adapter. The shoes have springs permanently attached to them to help maintain a distance between the shoes and the caliper. When brake shoes are replaced, only brake shoes formulation (such as Mopar® replacement parts) should be used. See Fig 5.
Front disc brakes are equipped with audible wear indicators on the inboard brake shoes. Each front brake rotor is vented to help cool it during and after brake applications. It is mounted on the studs of the front wheel bearing hub. The BR3 rotor can be easily identified by a recessed machined area near the hub center that is not present on a standard brake rotor.