OEM 2004 Buick Rendezvous Brake Master Cylinder

2004 Buick Rendezvous Brake Master Cylinder Parts and Q&A

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

  A: First disconnect the master cylinder from your vehicle and install it firmly in a vise. You need to see the back of the primary Piston for the brake overhaul. Examine the master cylinder reservoir exterior near its cap before taking off the cap and diaphragm for full assessment of all parts including replacement when necessary. Separate the master cylinder reservoir and gently push the primary Piston down with a smooth tool to extract the Piston retainer plus primary Piston parts from the cylinder. Safeguard both outlet ports following cylinder plugs before pumping filtered air from the front port to extract both pistons with their primary and secondary seals plus the return spring. You need to discard every part of the primary Piston ensemble including the Piston retainer and seals inside the secondary Piston. Clean main cylinder parts and install secondary Piston piece using denatured alcohol while mind soaks do not damage parts. Replace the entire master cylinder when you find any problems during the surface check. Press non-oiled filtered air to dry the master cylinder and components before staffing the master cylinder bore, secondary Piston , return spring, and overhaul parts with brake fluid from a clean container of delco supreme 11 fluid gm p/n 12377967 (Canadian P/N 992667) and equivalent dot-3 brake fluid. Fit the lubricated primary and secondary seals with their retainer to the secondary Piston before using the lube-coated return spring and secondary Piston assembly to install into the cylinder. Insert the new lubricated primary Piston system into the cylinder hole through a gentle round object that pushes down the Piston and positions the new retainer. Put the master cylinder reservoir onto its place and complete assembly by attaching the reservoir cap and diaphragm before reinstalling the complete unit into the vehicle.