Lucerne V6-3.9L (2009)
Brake Bleeding: Service and Repair
Hydraulic Brake System Flushing
Hydraulic Brake System Flushing
Warning: Refer to Brake Fluid Irritant Warning (See: Service Precautions/Technician Safety Information/Brake Fluid Irritant Warning).
Caution: Refer to Brake Fluid Effects on Paint and Electrical Components Caution (See: Service Precautions/Vehicle Damage Warnings).
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 Replacement (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master
Cylinder Replacement)
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Front Brake Hose Replacement (See: Hydraulic System/Brake Hose/Line/Service and Repair/Front Brake Hose Replacement)
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Rear Brake Hose Replacement (See: Hydraulic System/Brake Hose/Line/Service and Repair/Rear Brake Hose Replacement)
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Front Brake Caliper Replacement (See: Disc Brake System/Brake Caliper/Service and Repair/Removal and Replacement/Front Brake
Caliper Replacement)
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Rear Brake Caliper Replacement (See: Disc Brake System/Brake Caliper/Service and Repair/Removal and Replacement/Rear Brake
Caliper Replacement)
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Brake Pressure Modulator Valve Replacement (See: 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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Master Cylinder Replacement (See: Hydraulic System/Brake Master Cylinder/Service and Repair/Removal and Replacement/Master
Cylinder Replacement) ; also perform the following:
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: 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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Front Brake Hose Replacement (See: Hydraulic System/Brake Hose/Line/Service and Repair/Front Brake Hose Replacement)
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Rear Brake Hose Replacement (See: Hydraulic System/Brake Hose/Line/Service and Repair/Rear Brake Hose Replacement)
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Front Brake Caliper Overhaul (See: Disc Brake System/Brake Caliper/Service and Repair/Overhaul/Front Brake Caliper Overhaul) or
Front Brake Caliper Replacement (See: Disc Brake System/Brake Caliper/Service and Repair/Removal and Replacement/Front Brake
Caliper Replacement)
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Rear Brake Caliper Replacement (See: Disc Brake System/Brake Caliper/Service and Repair/Removal and Replacement/Rear Brake
Caliper Replacement)
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Brake Pressure Modulator Valve Replacement (See: Antilock Brakes / Traction Control Systems/Hydraulic Control Assembly - Antilock
Brakes/Service and Repair/Brake Pressure Modulator Valve Replacement)
4. If the brake fluid was NOT contaminated with an oil-based or a silicone-based substance, but WAS contaminated with water or dirt, rust,
corrosion, and/or brake dust, replace the brake master cylinder reservoir cap diaphragm. The diaphragm may have allowed the moisture or
