For 1990-2009 cars only
- Plug all the ports with suitable fittings which cannot damage the pipe seats.
- Run hoses from the fittings back into the reservoir.
- Hold the master cylinder 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 11 Brake Fluid GM P/N 12377967, or equivalent DOT 3 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 5 and 6 until fluid flows freely from the port and there is no evidence of air bubbles.
Caution: Use only Delco Supreme 11, GM P/N 12377967 (Canadian P/N 992667), 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 could result in damage to components, or loss of braking, with possible injury.
