GENERAL INFORMATION

Throughout this group, references may be made to a particular vehicle by letter or number designation. A chart showing the break down of these designations is included in the Introduction Section at the front of this service manual.

Standard brake equipment consists of:

²Double pin floating caliper disc front brakes.

²Rear automatic adjusting drum brakes.

²Differential valve with a brake warning switch.

²Master cylinder.

²Vacuum power booster.

²Double pin floating caliper rear disc brakes are available on some models.

The Anti-Lock braking system. Uses the standard power brake system caliper assemblies, braking discs, pedal assembly, brake lines and hoses. The unique parts of the Anti-Lock braking system consists of the following components. Unique proportioning valves, wheel speed sensors, tone wheels, electronic control units, modulator assembly and hydraulic assembly which replaces the conventional master cylinder and power booster. These components will be described in detail in the Anti-Lock brake section in this group of the service manual.

The front disc brake shoes have semi-metallic linings.

The hydraulic brake system (Figs. 1, 2 and 3) is diagonally split on both the Non-ABS and ABS braking system. With the left front and right rear brakes on one hydraulic system and the right front and left rear on the other.

The Non-ABS and ABS brake system uses different types of brake line fittings and tubing flares. The Non-ABS brake system uses double wall tubing flares and fittings at all tubing joint locations. The ABS brake system uses both ISO style tubing flares and double wall tubing flares and corresponding fittings at different joint locations. See (Figs. 2 and 3) for specific joint locations and type of tubing flare.

The front disc brakes consist of two different types of caliper assemblies. The double pin Kelsey-Hayes caliper (family caliper) with a bolt-on adapter attached to the steering knuckle, or a double pin Kelsey-Hayes caliper which mounts directly to rails on the steering knuckle. The non-family caliper.

CAUTION: Caliper pistons, boots and seals for the different caliper assemblies used on the front and rear disc brake assemblies are not interchangeable. Misusage could result in a complete brake system failure. Be sure that the parts are replaced with the correct replacement parts, refer to the parts book for the type and model year of the vehicle being worked on.

The master cylinder is anodized, lightweight aluminum, with a bore size of 24.0mm, 21.0mm or 7/8 inch.