G 1500 1/2 Ton Van V6-4.3L VIN W (1997)
Brake Master Cylinder: Vehicle Damage Warnings
WARNING: Always store brake fluid in a closed, sealed container. Never use previously opened containers of stored brake fluid. Always use
new brake fluid from a sealed container. Reseal brake fluid containers immediately after use. Brake fluid left in an open or improperly sealed
container will absorb moisture. This can lower the brake fluid's boiling point and result in system contamination, corrosion, deterioration of
rubber components and may cause brake system failure.
CAUTION:
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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, grease or other corrosion inhibitors) on
threaded fasteners or fastener pin 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.
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Brake fluid will damage electrical connections and painted surfaces. Use shop cloths, suitable containers, and fender covers to prevent brake fluid
from contacting these areas. Always reseal and wipe off brake fluid containers to prevent spills. If fluid Is spilled, immediately flush area with
water.
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Power steering fluid, engine oil, brake fluid, or any mineral based fluids cannot be mixed. If brake seals contact power steering fluid or steering
seals contact brake fluid, seal damage will result.
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Care must be taken to use the correct fluids on vehicles equipped with a hydraulic power brake booster. The brake master cylinder and brake
system uses DOT 3 brake fluid, while the hydraulic power brake booster system uses power steering fluid for power assist. Improper fluid, water,
or any other contaminants in the brake fluid may cause the brake fluid to boil or rubber component deterioration in the hydraulic system. Swollen
brake master cylinder seals show that rubber deterioration has occurred. Rubber deterioration is also shown by swollen wheel cylinder boots,
caliper boots, or the brake master cylinder.reservoir diaphragm. If rubber deterioration is found, replace all rubber components in the system,
including the hoses. Also check for fluid on the brake linings. If any is found, replace the linings.
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If the brake fluid is contaminated and the brake master cylinder piston seals are satisfactory, verify the system for any leaks or excessive heat
conditions. If no leaks or excessive heat conditions are found, flush the system.
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Do not hone the master cylinder bore. When the brake master cylinder Is overhauled, It Is recommended that the cylinder body be replaced rather
than "cleaned up" by honing the bore. The master cylinder has a hard, highly polished "bearingized" surface, which Is produced by diamond
boring followed by ball or roller burnishing under heavy pressure. Honing will destroy this hard smooth surface and cause rapid wear of the rubber
cups.
