GM Service Manual Online
For 1990-2009 cars only

Caution: When adding fluid to the brake fluid reservoir or to the clutch fluid reservoir, use only Super DOT-4 or equivalent DOT-4 brake fluid from a clean, sealed container. This polyglycol brake fluid is hygroscopic and absorbs moisture. Do not use fluid from an open container that may be contaminated with water. Improper or contaminated fluid could result in damage to the system components.

Note: The operation hydraulic brake system flushing corresponds to the operation hydraulic brake system bleeding. Refer to Hydraulic Brake System Bleeding.

This operation must be undertaken on all bleeder valves.