1995 Oldsmobile Ciera Brake Service (ONLINE REPAIR MANUALS)

Service Brake Adjustment

• Raise and support vehicle.
• Mark relationship of wheel to axle, then remove wheel and tire assembly.
• Remove brake drum. If drum is difficult to remove, proceed as follows:
• Ensure parking brake is released.
• Back off parking brake cable adjustment.
• Remove access hole plug from backing plate, insert screwdriver through hole and push parking brake lever off its stop.
• Insert punch through hole in splash shield Fig. , tap on punch to loosen drum. Then remove drum.
• Measure inside diameter of drum using special tool J 21177-A or J22364-01 or equivalent.
• Adjust by turning star...

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 caliper assembly as described in "Caliper Service."
• Remove shoe and lining assemblies from caliper, Figs. through , noting the following:
• On models with tab mount outer shoe (all except series 3264), straighten bent over shoe tabs with suitable pliers.
• On models with spring mount outer shoe (series 3264), insert screwdriver between shoe and caliper and disengage buttons on shoe from holes in caliper.
• Remove sleeves and bushings from grooves in caliper mounting bolt holes, Figs. through .

Installation

• Lubricate new bushings with suitable grease, install bushings in cali...

AC-Delco Tandem Diaphragm Type

1994

Disassemble

• Remove pedal pushrod boot, silencer, check valve, vacuum switch and grommets, as equipped, then the front housing seal.
• Scribe matching marks between front and rear housing sections, then mount booster assembly in suitable holding fixture with rear housing facing up.
• Apply pressure to housing with holding fixture forcing screw and rotate rear housing counterclockwise to unlock housing halves.
• Slowly release spring tension, then remove booster assembly from holding fixture. Do not allow spring tension to release suddenly, as dama...

Two basic types of power assist mechanisms are used: vacuum assist diaphragm assemblies, which use engine vacuum or, in some cases vacuum pressure developed by an external vacuum pump. The second type is a hydraulic pressure assist mechanism, which use pressure developed by an external pump (usually the power steering pump). Both systems act to increase the force exerted on the master cylinder piston by the operator. This in turn increases the hydraulic pressure delivered to the wheel cylinders, while decreasing driver effort necessary to obtain acceptable stopping performance.

V...