System Components

General Description

The Premier four-wheel disc brake system consists of single piston, slidertype front and rear calipers, composite material disc brake rotors, a proportioning valve, a cartridge-type master cylinder and a dual diaphragm, vacuum power brake booster.

Rotors

Two different disc brake rotors are used. The front rotors are vented. The rear rotors are solid (non-vented).

FIGURE 1:

Disc Brake Calipers

The same front calipers are used on all Premier models. The front calipers are serviceable and can be overhauled when necessary.

The rear calipers are a unique, dual function design (Fig. 1). They serve as the normal wheel brake units and as the vehicle parking brakes. The rear calipers are not serviceable with individual components and must be replaced as a complete assembly when diagnosis indicates this is necessary.

Although two different calipers are used, both designs are single piston, slider-type calipers. The calipers are mounted with slide pins and bushings to allow the necessary lateral movement during operation.
Proportioning Valve

A proportioning valve is used in the Premier four-wheel disc brake system. The valve provides balanced brake action during high and low pedal effort stops.

Master Cylinder/Power Booster

The master cylinder/power booster in the four-wheel disc brake system, are similar to those on Premier models with standard front disc/rear drum brakes. They are similar in appearance only and are not interchangeable.

Brake pads

The brake lining on the front and rear brake shoes is made from an organic material. The lining material does not contain asbestos in any form.

FIGURE 2:

Rear Caliper Mounting

The rear caliper is mounted on the rear axle spindle/brake adaptor which is attached to the rear trailing arm (Fig. 2). The rotor is mounted on the axle hub. Two slide pins are used to secure the caliper to the axle spindle/brake adaptor.