Sierra 1500 4WD V8-5.3L VIN Z Flex Fuel (2005)
Brake Bleeding: Service and Repair
Hydraulic Brake System Flushing
HYDRAULIC BRAKE SYSTEM FLUSHING
Caution: Brake fluid may irritate eyes and skin. In case of contact, take the following actions:
* Eye contact--rinse thoroughly with water.
* Skin contact--wash with soap and water.
* If ingested--consult a physician immediately.
Notice: Avoid spilling brake fluid onto painted surfaces, electrical connections, wiring, or cables. Brake fluid will damage painted surfaces and cause
corrosion to electrical components. If any brake fluid comes in contact with painted surfaces, immediately flush the area with water. If any brake fluid
comes in contact with electrical connections, wiring, or cables, use a clean shop cloth to wipe away the fluid.
1. Inspect the brake fluid for the following conditions, indicating brake fluid contamination:
» Fluid separation, indicating two types of fluid are present. A substance other than the recommended brake fluid has been introduced into the brake
hydraulic system.
- Swirled appearance--Oil-based substance
- Layered appearance--Silicone-based substance
» Fluid discoloration, indicating the presence of moisture or particles that have been introduced into the brake hydraulic system.
- Cloudy appearance--Moisture
- Dark appearance/suspended particles in fluid--Dirt, rust, corrosion, brake dust
2. Inspect the master cylinder reservoir cap diaphragm and the reservoir-to-master cylinder grommets for swelling, indicating brake fluid
contamination.
3. If the brake fluid WAS contaminated with an oil-based or a silicone-based substance, indicated by fluid separation and/or a swollen master
cylinder reservoir cap diaphragm and/or swollen reservoir-to-master cylinder grommets, perform the following:
3.1.
Remove ALL of the following components listed from the vehicle. Each component contains internal rubber seals/linings which have been
contaminated by the contaminated brake fluid.
Refer to the procedures indicated.
- Master Cylinder Replacement
- Front Brake Hose Replacement
- Rear Brake Hose Replacement
- Front Brake Caliper Replacement
- Rear Brake Caliper Replacement
- Brake Pressure Modulator Valve Replacement
3.2.
Clean out all the hydraulic brake pipes using denatured alcohol, or equivalent.
3.3.
Dry the brake pipes using non-lubricated, filtered air.
3.4.
Repair or replace ALL of the following components listed and install them to the vehicle. Each component contains internal rubber
seals/linings which have been contaminated by the contaminated brake fluid in the brake hydraulic system.
Refer to the procedures indicated.
- Master Cylinder Replacement - Also perform the following:
