Rear Disc Brakes
CALIPER
Remove or Disconnect
1. Two-thirds of the brake fluid from master cylinder.
2. Raise vehicle and support with safety stands.
3. Mark relationship of wheel to hub.
4. Tire and wheel.
Compressing The Caliper Piston:
5. Position a C-clamp and tighten until piston bottoms in bore.
6. C-Clamp.
7. Brake hose.
Disc Brake Assembly:
8. Bolt (2).
9. Support key (3) and spring (4).
Removing The Caliper Support Key:
^ Use a brass punch and a hammer to drive the support key out.
Suspending The Caliper:
10. Caliper assembly (1).
NOTE: Inspect the inside of the caliper assembly for signs of fluid leakage. If any is found, refer to Overhaul.
Clean: Use a wire brush to remove any corrosion from the machined surfaces of the anchor plate and caliper.
Install or Connect
CAUTION: Always use the correct fastener in the proper location. When you replace a fastener, use ONLY the exact part number for that application. General Motors will call out those fasteners that require a replacement after removal. General Motors will also call out the fasteners that require thread lockers or thread sealant. Unless otherwise specified, do not use supplemental coatings (paints, greases, or other corrosion inhibitors) on threaded fasteners or fastener joint interfaces. Generally, such coatings adversely affect the fastener torque and joint clamping force, and may damage the fastener. When you install fasteners, use the correct tightening sequence and specifications. Following these instructions can help you avoid damage to parts and systems.
NOTE: Any new rotor must have the protective coating removed from the friction surfaces before being placed in service. Use Goodwrench Brake Parts Cleaner (GM P/N 12345754), or equivalent, and wipe the surface clean with clean cloths. Do not use gasoline, kerosene or other oil-based solvents which may leave an oily residue. This residue is damaging to brake linings and flammable.
1. Lubricate caliper and anchor plate sliding surfaces with Shell Aeroshell Grade 5 lubricant or equivalent.
Suspending The Caliper:
2. Caliper assembly.
CAUTION: Make sure the brake hose Is not twisted or kinked after installation. Damage to the hose could result.
CAUTION: Do not use "never sieze" type products on the caliper V-ways and anchor plate guide way surfaces. These products are not lubricants and result in high caliper slide forces, which can cause increased wear of the brake pads.
Installing The Caliper Support Key:
3. Spring (4) and support key (3). Use a brass punch and hammer to drive the support key in place.
4. Caliper lock mounting bolts. The boss on the bolt must fit into the circular cutout in the key.
^ Tighten bolts to 20 Nm (15 lb. ft.).
5. Brake hose.
^ Tighten brake hose bolt to 45 Nm (33 lb. ft.).
6. Bleed brake system. Refer to Hydraulic System Service and Repair.
7. Tire and wheel.
8. Lower the vehicle.
CAUTION: Before moving the vehicle, pump the brake pedal several times to make sure it is firm. Do not move the vehicle until a firm pedal is obtained. Check the brake fluid level in the master cylinder after pumping the brakes.