Front Disc Brakes

Front Disc Brake System Components:

Front Disc Brake Caliper Assembly (Exploded View):

The single piston, floating caliper disc brake assembly consists of:
- The driving hub.
- Braking disc (rotor).
- Caliper assembly.
- Shoes and linings.





The double pin Kelsey-Hayes caliper is mounted directly to the steering knuckle, using bushings, sleeves, and 2 caliper guide pin bolts which thread directly into the steering knuckle.

The 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 piston seal is designed to assist in maintaining the proper brake shoe to rotor clearance.

All the front brake forces generated during braking of the vehicle are taken up directly by the steering knuckles of the vehicle.

The caliper is a one piece casting with the inboard side containing a single piston cylinder bore.

The 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. It provides a hydraulic seal between the piston and the cylinder wall.

The molded rubber dust boot mounts in a counter bore of the cylinder bore opening and in a groove which is machined in the outer surface of the piston. This prevents contamination of the piston and the bore area.

As lining wears, reservoir level will go down. If fluid has been added, reservoir overflow may occur when the piston is pushed back into the new lining position. Overflowing can be avoided by removing a small amount of fluid from the master cylinder reservoir.