Equinox AWD V6-3.4L (2008)
Brake Bleeding: Service and Repair
Hydraulic Brake System Flushing
Hydraulic Brake System Flushing
Caution: Refer to Brake Fluid Irritant Caution .
Notice: When adding fluid to the brake master cylinder reservoir, use only GM approved or equivalent DOT-3 brake fluid from a clean, sealed brake
fluid container. The use of any type of fluid other than the recommended type of brake fluid may cause contamination which could result in damage to
the internal rubber seals and/or rubber linings of hydraulic brake system components.
Notice: Refer to Brake Fluid Effects on Paint and Electrical Components Notice .
1. Inspect the brake fluid for the following conditions, indicating brake fluid contamination:
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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
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Swirled appearance-Oil-based substance
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Layered appearance-Silicone-based substance
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Fluid discoloration, indicating the presence of moisture or particles that have been introduced into the brake hydraulic system
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Cloudy appearance-Moisture
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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:
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 in the brake hydraulic system.
Refer to the procedures indicated:
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Master Cylinder Reservoir Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and
Repair/Removal and Replacement/Master Cylinder Reservoir Replacement)
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Master Cylinder Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal
and Replacement/Master Cylinder Replacement)
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Front Brake Hose Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Hose/Line/Service and Repair/Front Brake
Hose Replacement)
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Rear Brake Hose Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Hose/Line/Service and Repair/Rear Brake
Hose Replacement)
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Front Brake Caliper Replacement (See: Brakes and Traction Control/Disc Brake System/Brake Caliper/Service and Repair/Front Brake
Caliper Replacement)
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Rear Brake Caliper Replacement (See: Brakes and Traction Control/Disc Brake System/Brake Caliper/Service and Repair/Rear Brake
Caliper Replacement)
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Brake Pressure Modulator Valve Replacement (See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Hydraulic
Control Assembly - Antilock Brakes/Service and Repair/Brake Pressure Modulator Valve Replacement)
2. Clean out all the hydraulic brake pipes using denatured alcohol, or equivalent.
3. Dry the brake pipes using non-lubricated, filtered air.
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:
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Clean the brake master cylinder reservoir using denatured alcohol, or equivalent, then dry the reservoir using non-lubricated, filtered air.
Inspect the reservoir for cracks and/or damage and replace if necessary. Refer to Master Cylinder Reservoir Replacement (See: Brakes and
Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master Cylinder Reservoir
Replacement) . Replace the brake master cylinder reservoir cap diaphragm.
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Master Cylinder Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Master Cylinder/Service and Repair/Removal
and Replacement/Master Cylinder Replacement)
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Front Brake Hose Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Hose/Line/Service and Repair/Front Brake
Hose Replacement)
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Rear Brake Hose Replacement (See: Brakes and Traction Control/Hydraulic System/Brake Hose/Line/Service and Repair/Rear Brake
Hose Replacement)
