GM Service Manual Online
For 1990-2009 cars only

Filling The Master Cylinder Reservoir

Caution: Do not overfill the brake fluid reservoir. Overfilling the brake fluid reservoir may cause the brake fluid to overflow onto the engine exhaust components during brake system service. The brake fluid is flammable and may cause a fire and personal injury if the brake fluid contacts the engine exhaust system components.

Caution: Use only SUPREME 11 or equivalent DOT 3 brake fluid from a clean, sealed container. Do not use fluid from an open container that may be contaminated with water. Improper or contaminated fluid will result in damage to components or loss of braking, with possible personal injury.

    • The master cylinder reservoir is on the master cylinder.
    • The reservoir is located under the hood on the left side of the vehicle.
    • The master cylinder reservoir contains enough fluid so that the reservoir does not need service under normal conditions.
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Object Number: 179703  Size: SH
  • A low fluid sensor in the master cylinder will warn of a low fluid level.
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  • Clean the reservoir cap before removal in order to avoid getting dirt in the reservoir.
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  • Remove the twist cap and the diaphragm.
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  • Do not fill the reservoir past the maximum fill level.
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  • Reinstall the cap and the diaphragm when the reservoir is full.