OEM 2004 Buick Park Avenue Brake Master Cylinder

2004 Buick Park Avenue Parts Questions & Experts Answers

• Q: How to overhaul the brake master cylinder on 2004 Buick Park Avenue?

  A: To rebuild the Brake Master Cylinder, start by removing the Brake Master Cylinder from the vehicle and lock the mounting flange in a bench vise so you can access the rear of primary Piston. Clean the area surrounding the reservoir cap and remove the cap and diaphragm, which must then be inspected for cuts, cracks, nicks, or deformation and any peel-off parts must be changed. Remove the master cylinder reservoir and press down at the primary Piston using a smooth, round ended tool to lift out the primary Piston retainer, and then to remove the assembly to the cylinder bore. Plug the cylinder inlet ports and the back outlet, so that you can then apply low pressure non lubricating, filtered air on the front outlet port to get rid of the secondary Piston with the primary and secondary seals and return spring. Remove the primary Piston assembly and Piston retainer, as well as seals residing in the secondary Piston. Clean the interior and exterior of the master cylinder, secondary Piston, and return spring using denatured alcohol, inspecting for cracks, scoring, pitting, or corrosion, and replace master cylinder if any problems exist. Dry all components with non-fabricated, filtered air and lubricate the master cylinder bore, secondary Piston, return spring, and all overhaul components with delco supreme 11(R) (GM U.S. P/N 12377967, GM Canada P/N 992667) or equal to dot 3 brake fluid from a clean, sealed container. Mount the pipes of this part onto the assembly packagethen sanitize the screensmembersdenominate the main seal and the retainer and attribute the updistance the secondary seal to the secondary Piston )put down the lubricated return spring ant the pipe of this instrument into the big bore of the cylanders. Next, install the new lubricated primary Piston assembly into the cylinder bore, press the primary Piston with a smooth round ended tool and install the new Piston retainer. Replace the master cylinder reservoir and the cover and diaphragm, and reinstall the master cylinder to the vehicle.