For 1990-2009 cars only
- With suitable fittings which cannot damage the pipe seats, run hoses from the fittings back into the reservoir.
- Hold the master cylinder in a vise securely by the mounting flange so as not to cause any distortion and to enable the pistons to be stroked.
- Fill the reservoir with new Delco® Supreme II Brake Fluid GM P/N 12377967, or equivalent DOT 3 brake fluid, and be sure the end of the hose going into the top of the master cylinder is fully submerged in brake fluid.
- Depress the pistons to fully bottom out the master cylinder. To depress the pistons use a rod with a blunt end which will not damage the pushrod location on the primary piston, or cause contamination in the master cylinder bore.
- Return the pistons to their released position.
- Repeat Steps 4 and 5 until fluid flows freely from the port and there is no evidence of air bubbles.
Notice: When filling the master cylinder, use only Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT 3 brake fluid. Do not use a container which has been used for petroleum based fluids, or a container which is wet with water. Petroleum based fluids will cause swelling and distortion of rubber parts in the hydraulic brake system, and water will mix with brake fluid, lowering the boiling point. Keep all fluid containers capped to prevent contamination.
