1996 Chevrolet Impala SS Brake Service (ONLINE REPAIR MANUALS)

• Grease or any other foreign material must be kept off the brake linings, caliper, surfaces of the disc and external surfaces of the hub, during service procedures. Handling the brake disc and caliper should be done in a way to avoid deformation of the disc and nicking or scratching brake linings.
• If inspection reveals rubber piston seals are worn or damaged, they should be replaced immediately.
• During removal and installation of a wheel assembly, exercise care so as not to interfere wi...

AC-Delco Tandem Diaphragm Type

This unit utilizes a vacuum power chamber, consisting of a front and rear shell, housing divider, front and rear diaphragm, plate assemblies, hydraulic pushrod and a diaphragm return spring, Figs. and .

In normal operating mode, with service brakes in released position, the booster operates with vacuum on both sides of its diaphragms. When brakes are applied, air at atmospheric pressure is admitted to one side of each diaphragm to provide power assist. When the service brake is released, atmospheric air is shut off from one side of each diaphragm. The a...

Removal

• Remove ^2/3 of the total brake fluid capacity from master cylinder reservoir.
• Raise and support vehicle, then remove tire and wheel assembly.
• Install two wheel retaining nuts to retain rotor in position.
• Position one end of a suitable C-clamp against inlet fitting bolt, and the other end against outboard shoe and lining, then tighten clamp as shown, Fig. , until piston fully bottoms in caliper bore.
• Remove upper guide pin bolt and discard.
• Loosen lower guide pin bolt, then pivot caliper downward on lower guide pin bolt to expose shoe & lining assemblies. Use care to avoid dam...

Parking Brake

• Release parking brake lever, then raise and support vehicle.
• Remove rear wheels then install lug nuts on two opposite wheel studs to hold brake rotor in position.
• Back caliper pistons into bores.
• Loosen parking brake cable adjusting nut until there is no tension on parking brake shoes.
• Turn each brake rotor until parking brake shoe star adjuster is visible through hole in rotor.
• Adjusting one side at a time, tighten adjuster until rotor cannot be turned by han...

Manual

Pressure bleeding is recommended for all hydraulic systems. However, if a pressure bleeder is unavailable, use the following procedure. Brake fluid damages painted surfaces. Immediately clean any spilled fluid.

• Remove vacuum reserve by pumping brakes several times with engine off.
• Fill master cylinder reservoir with clean brake fluid. Check fluid level often during bleeding procedure; do not let reservoir fall below half full.
• If necessary, bleed master cylinder as follows:
• Disconnect master cylinder forward brake line connection until fluid flows from reservoir. Reconnect ...

System Operation

Front & Rear Split System

When the brake pedal is depressed, both the primary (front brake) and the secondary (rear brake) master cylinder pistons are moved simultaneously to exert hydraulic fluid pressure on their respective systems, .

If the rear (secondary) brake system fails, initial brake pedal movement will cause the unrestricted secondary piston to bottom in the master cylinder bore. Primary piston movement will displace hydraulic fluid in the primary section of the master cylinder to actuate the front brake system.

If the front (primary) brake system fails, init...