2002 Chevrolet Impala Brake Service (ONLINE REPAIR MANUALS)

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. Do not let reservoir fall below half full during bleeding procedure.
• If required, bleed master cylinder as follows:
• Loosen master cylinder forward brake line connection until fluid flows from reservoir, then tighten brake line.
• Have assistant t...

• Remove ^2/3 of brake fluid from master cylinder reservoir.
• Raise and support vehicle.
• Mark relationship of wheel to axle flange, then remove wheel and tire assembly.
• Remove bolt and washer attaching cable support bracket to caliper body, Fig. .
• Remove sleeve bolt and pivot caliper assembly up, Fig. . Do not completely remove caliper assembly body.
• Remove outboard and inboard shoe and linings, then two pad clips from caliper support.
• Turn piston assembly and thread it into caliper body assembly using a suitable spanner type tool in piston slots.
• After bottoming piston, lift inner edge ...

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 required to obtain acceptable stopping performance.

Vac...

Parking Brake

• Cycle brake system as follows:
• Apply service brake with a pedal force of 175 lbs., and release.
• Fully apply parking brake using approximately 125 lbs., of force on final stroke, then release.
• Apply and release parking brake two additional times as described above.
• Inspect parking brake pedal assembly for full release by turning ignition On and observing brake warning lamp, which should be off.
• If brake warning lamp is on and parking brake appears to be fully released, operate manual pedal release lever and pull downward on front park brake cable to remove slack from pedal as...

• After disassembling power brake unit, soak metal components in solvent.
• Use only alcohol on components containing rubber. After components have been thoroughly cleaned and rinsed in solvent, they should be washed again in clean alcohol before assembly.
• Use compressed air to blow dirt and cleaning fluid from ...

The caliper assembly, Fig. , has a single bore and is mounted to the support bracket with two mounting bolt and sleeve assemblies. Hydraulic pressure created by applying the brake pedal is converted by the caliper to a stopping force. This force acts equally against the piston and the bottom of the piston bore to move the piston outward and to slide the caliper inward resulting in a clamping action. This clamping action presses the linings against the rotor, creating friction to stop the vehicle.

When the parking brake is applied, the external caliper parking brake lever moves and ro...