OEM 2005 Chevrolet Uplander Brake Master Cylinder

2005 Chevrolet Uplander Parts Questions & Experts Answers

• Q: How to overhaul the brake master cylinder on 2005 Chevrolet Uplander?

  A: Install the Brake Master Cylinder in a bench vise with the back of the main Piston exposed. You should clean the reservoir area outside the master cylinder cap before taking it apart for visual examination of the parts. After verifying both components are safe to reuse, replace any components that show damage in this step. Patent the closed master cylinder reservoir then operate a smooth slim tool to push the primary Piston. This dislodges the Piston retainer and frees the primary Piston assembly from the cylinder chamber. Insert plugs into cylinder inlet ports and rear outlet port before filling the front outlet port with low pressure filtered air. The secondary Piston will push out the primary seal, secondary seal, return spring, and itself with no lubricants needed. Do away with the primary Piston parts as well as the Piston retainer and seals. Clean all areas of the master cylinder and secondary Piston return spring using denatured alcohol while rejecting abrasive materials to find and replace the master cylinder when damage appears in the components. Use dry cleaned filtered air to make all components free from fluids afterward apply delco supreme ii® brake fluid p/n 12377967 or its equivalent from a sealed fresh container to the master cylinder bore and its parts. Put the rubber parts of the new primary seal and retainer with the secondary seal onto the secondary Piston. Install the return spring and secondary Piston assembly with lubricated components into the cylinder bore before placing the lubricated new primary Piston assembly. Press the new Piston retainer into place with a smooth tool to install it then reconnect the master cylinder reservoir and its components. Finally, secure the master cylinder to its original position.