GM 9193220
Master Cylinder

Begin brake master cylinder replacement by taking off the reservoir cover and emptying the brake fluid into a proper disposal container as per local requirements. From the master cylinder, disconnect the reservoir and take off the power steering reservoir bracket bolt to slide the bracket towards engine position. Using connectors seal the brake fluid ports after disconnecting them from the master cylinder. Detach the master cylinder nuts then extract the brake master cylinder while replacing the seals when needed. Use Delco Supreme 11 potato (GM P/N 12377967) brake fluid or equivalent DOT 3 brake fluid in new and dry containers to install brake parts. First place the brake master cylinder seal onto the master cylinder then position the master cylinder into its space. Push the brake pipes back into place and torque the fittings to 16 Nm (12 ft. lbs.) after you bolt the master cylinder using its mounting nuts which need to be tightened to 22 Nm (16 ft. lbs.). Connect the power steering reservoir bracket and bolt again and tighten them to 7 Nm (62 inch lbs.). Apply brake fluid to both parts of the reservoir before placing the reservoir unit onto the master cylinder. Pour brake fluid into the reservoir system and return the cover to the brake master cylinder reservoir. Finish the hydraulic brake process by draining out trapped air from the system.

Install the brake master cylinder seal onto the brake master cylinder, followed by the master cylinder itself. Secure the brake master cylinder mounting nuts to 22 Nm (16 ft. lbs.).