Front Disc Brakes

The front disc brake assembly used on this vehicle consists of the following components.
- Disc brake caliper
- Shoes and linings
- Brake Rotor

Front Disc Brake Caliper Assembly:

Disc Brake Caliper Mounting:

Disc Brake Caliper. The floating double pin single piston calipers used on this vehicle are mounted directly to the steering knuckles and use no adapter. The caliper is mounted to the steering knuckle using bushings, sleeves and 2 through bolts which thread directly into the steering knuckle.
The floating double pin single piston calipers, used on this vehicle are mounted directly to the steering knuckles and use no adapter. The caliper is mounted to the steering knuckle using bushings, sleeves and 2 through bolts which thread directly into the steering knuckle.
Two machined abutments on the steering knuckle position and align the caliper fore and aft. The guide pin bolts, sleeves, and bushings control the side-to-side movement of the caliper.
The disc brake calipers have shoe retractor clips attached to the inner and outer brake shoe and lining assemblies. The brake caliper also has brake shoe retractor clips to help pull the front disc brake shoes away from the rotor.

WARNING: THE PISTONS THAT ARE USED IN THE FRONT AND REAR DISC BRAKE CALIPER ASSEMBLIES ARE UNIQUE TO THE CALIPER THEY ARE USED IN. THE DIMENSIONS OF THESE PISTONS ARE DIFFERENT, DO NOT INTERCHANGE THE CALIPER PISTONS. IMPROPER USE COULD CAUSE A COMPLETE FAILURE OF THE BRAKE SYSTEM.

The caliper is a one piece casting with the inboard side containing a single piston cylinder bore. The front disc brake caliper phenolic piston is 60 mm (2.36 inch) in diameter.

Fig. 2 Piston Seal Function:

A square cut rubber piston seal is located in a machined groove in the cylinder bore. This provides a hydraulic seal between the piston and the cylinder wall. The piston seal is designed to pull the piston back into the bore of the caliper when the brake pedal is released. This, along with the brake shoe retractor clips, maintains the proper brake shoe to rotor clearance.
A molded rubber dust boot is installed in a groove in the cylinder bore and the piston, keeping contamination from the cylinder wall and the piston.
As brake shoe linings wear, master cylinder reservoir brake fluid level will go down. If brake fluid has been added to the reservoir, reservoir overflow may occur when the piston is pushed back into the new lining position. Overflowing can be avoided in this case by removing a small amount of fluid from the master cylinder reservoir.

Brake Shoes. The brake shoe lining material used has been specifically formulated to meet the braking requirements of the vehicle. When brake shoes are replaced, only brake shoes meeting the original equipment manufacturer formulation (such as Mopar replacement parts) should be used. This will maintain the original braking performance of this vehicle. An audible wear indicator is mounted on the outboard pad of the front disc brake assemblies. Upon contact with the brake rotor, this indicator emits a sound, signaling that brake shoes may need inspection and/or replacement.

Brake Rotor. The purpose of the rotor is to slow down and stop the front wheels of the vehicle. This is accomplished by applying the brake shoes against the braking surfaces of the rotor. The rotor is made of iron and is vented to help cool it during brake applications. The hub and bearing is used to mount the front brake rotor and wheel.