1994 Chevrolet Impala SS Brake Service (ONLINE REPAIR MANUALS)

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...

• Remove caliper assembly from steering knuckle as described in "Caliper Removal" under "Caliper Service."
• On models with anti-lock brakes, proceed as follows:
• Remove wheel speed sensor retaining bolt from rear side of steering knuckle.
• Remove wheel speed sensor from steering knuckle and position aside.
• On all models, remove wheel bearing lubricant cap from center of rotor.
• Remove cotter pin, nut and washer from steering knuckle assemb...

• 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 norm...

CALIPER REMOVAL

• Siphon enough brake fluid out of the master cylinder to bring fluid level to ^1/3 full to avoid fluid overflow when the caliper piston is pushed back into its bore.
• Raise vehicle and remove front wheels.
• Using a C-clamp, as illustrated in Fig. , push piston back into its bore.
• If caliper assembly is to be serviced, remove inlet fitting attaching bolt, copper washer, and inlet fitting from caliper housing. Plug opening in inlet fitting to prevent fluid loss and contamination. Do not crimp brake hose, as this may damage internal structure of hose. If only shoe and linin...

REMOVAL

• Raise and support rear of vehicle, then remove tire and wheel assembly.
• Remove brake drum. If brake lining is dragging on brake drum, back off brake adjustment by rotating adjustment screw. If brake drum is rusted or corroded to axle flange and cannot be removed, lightly tap axle flange to drum mounting surface with a suitable hammer.
• Using brake spring pliers or equivalent, unhook primary and secondary return springs, Fig. and . Observe location of brake parts being removed to aid during installation.
• Remove brake hold-down springs with suitable tool.
• Lift actuating lever, th...