1995 Chevrolet Caprice Brake Service (ONLINE REPAIR MANUALS)

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...

Master Cylinder Overhaul

Except Aurora, Bonneville, Corvette, LeSabre, Park Avenue, Riviera, 88 & 98

Disassemble

Refer to Figs. and when performing the following procedures.

• Remove master cylinder from vehicle as follows:
• Disconnect and plug hydraulic lines.
• Remove two master cylinder attaching nuts, then the master cylinder.
• Remove reservoir cover and diaphragm. Discard old brake fluid in reservoir.
• Inspect cover and diaphragm. Replace if cut, cracked or deformed.
• Remove fluid level switch, if equipped.
• On models with compact master cylinder, remove proportioner valve assembly, Fig. ...

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...

• Inspect components for damage and unusual wear. Replace as necessary.
• Inspect wheel cylinders. Boots which are torn, cut or heat damaged indicate need for wheel cylinder replacement.
• On type 1 brakes, remove wheel cylinder links. Fluid spill from boot center hole indicates cup leakage and need for wheel cylinder replacement.
• On type 2 brakes, use a small screwdriver to pry center hole of boot away from piston. If fluid spills from center hole, cup leakage is indicated and wheel cylinder should be replaced.
• On all types, light fluid coatings on piston within cylinder is considered normal.
• ...

When working on or around brake assemblies, care must be taken to prevent breathing asbestos dust, as many manufacturers incorporate asbestos fibers in the production of brake linings. During routine service operations the amount of asbestos dust from brake lining wear is at a low level due to a chemical breakdown during use, and a few precautions will minimize exposure.

• Do not sand or grind brake linings unless suitable local exhaust ventilation equipment is used to prevent excessive asbestos exposure.
• Wear a suitable respirator approved for asbestos dust use during all repair proced...