Envoy 4WD V8-5.3L VIN M (2005)
3. Disconnect the brake pipes from the master cylinder.
4. Important: Install a rubber cap or plug to the exposed brake hose fitting ends in order to prevent brake fluid loss and contamination.
Plug the brake pipes.
5. Remove the master cylinder mounting nuts.
6. Remove the master cylinder assembly.
7. Drain the master cylinder of brake fluid.
Installation Procedure
1. Bench bleed the master cylinder.