Front Disc
Each front disc brake assembly consists of the following components.
- Caliper - single piston, floating type.
- Shoe and lining assemblies.
- Rotor.
Two machined abutments on the steering knuckle position the caliper. The guide pin bolts, sleeves, and bushings control the side-to-side movement of the caliper. All of the front brake force generated during braking of the vehicle is taken up directly by the steering knuckles. There are 2 mounted brake shoes mounted to each caliper, one inboard and one outboard. When brake shoes are replaced, only brake shoes meeting the original equipment manufacturer (OEM) formulation (such as MOPAR® replacement parts) should be used. The brake shoe linings contact the brake rotor. 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.
When the brakes are applied, fluid pressure is sent to each brake caliper. The pressure at the caliper is exerted equally against the caliper piston. The pressure applied to the piston is transmitted directly to the inboard brake shoe. This forces the shoe lining against the inner surface of the brake rotor. At the same time, fluid pressure within the caliper piston bore forces the caliper to slide inward on its guide pins. This action brings the outboard shoe lining into contact with the outer surface of the brake rotor. This pressure on both sides of the brake rotor causes friction, bringing the vehicle to a stop.
A square-cut rubber piston seal is located in a machined groove in the caliper cylinder bore. This provides a hydraulic seal between the piston seal and is designed to pull the piston back into the bore of the caliper when the brake pedal is released. This maintains the proper brake shoe-to-rotor clearance.
A rubber dust boot is installed in the cylinder bore opening and in a groove in the piston. This prevents contamination in the bore area.
As front disc brake shoe linings wear, master cylinder reservoir brake fluid level will drop. Fluid level should be checked after replacing shoes. Front disc brakes are equipped with an audible wear indicator on each outboard brake pad. This wear indicator emits a sound when the brake lining may need inspection or replacement.