Front Disc Brakes

DESCRIPTION - DISC BRAKES (FRONT) - SRT-4





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 components (Fig. 7):
^ Caliper - single-piston, floating type
^ Caliper adapter
^ Shoe and lining assemblies (Pads)
^ Rotor
The BR3 brake caliper can be easily identified. Each BR3 brake caliper is painted red and is marked "Turbo" referring to the engine package the vehicle is equipped with. The caliper is a one-piece casting with the inboard side containing a single piston cylinder bore. The front disc brake caliper piston, is manufactured from a phenolic compound. The outside diameter of the caliper piston is 57 mm.





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 (Fig. 8).





A rubber dust boot is installed in a groove in cylinder bore opening and in a groove in the piston (Fig. 9). The boot prevents contamination in the bore area.





The BR3 caliper is mounted to the caliper adapter using two guide pin bolts. These bolts thread into two guide pins, slid into the adapter (Fig. 10). The pins are lubricated and have boots to seal them in place in the adapter.





The caliper adapter is fastened to the steering knuckle using two bolts (Fig. 11).





The machined abutments on the adapter position the brake shoes and caliper. There are two brake shoes, sometimes referred to as pads, per disc brake. One shoe is placed on each side of the brake rotor (Fig. 12). Two 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 meeting the Original Equipment Manufacturer (OEM) formulation (such as Mopar replacement parts) should be used.

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 (Fig. 13).

NOTE: Special care should be taken to assure that the correct caliper is used only with the correct rotor.