OEM Chevrolet Uplander Brake Master Cylinder

Chevrolet Uplander Brake Master Cylinder Parts and Q&A

• Master Cylinder
  18022002
  Q: How to replace the brake master cylinder on Chevrolet Uplander?

  A:

  Before working on the Brake Master Cylinder you need to disconnect its electrical connector and brake pipes from the master cylinder while also sealing brake pipe openings with rubber parts to avoid brake fluid loss and pollution. You start by plugging the opened brake pipe ends and unscrewing the master cylinder mounting nuts to take the cylinder out of the vehicle while draining all brake fluid from the reservoir. Bleed the master cylinder at the bench before connection to the Brake Booster. Tighten its mounting nuts to 29 n.m (21 lb ft). Plug the brake pipes first then attach them to the master cylinder with 32 n.m torque and connect the electrical plug to the Brake Fluid Level Sensor. Conclude the hydraulic brake system bleaching process.
• Master Cylinder
  19209193
  Q: How to overhaul the brake master cylinder on Chevrolet Uplander?

  A:

  Install the Brake Master Cylinder in a vise on a workbench to provide good access to the back of the primary Piston during repairs. First clean the area around the master cylinder reservoir cap and take out the cap with diaphragm when you are ready to inspect them for damage and replace any faulty parts. After disconnecting the reservoir you can push the primary Piston down with a rounded tool. This removes the Piston retainer part and the primary Piston unit from the cylinder structure. Connect all cylinder ports then insert filtered low air pressure into the front outlet port to push out the secondary Piston, primary sets, secondary sets and return spring for disposal. Keep the primary Piston parts for replacement. Wipe down the inside and outside of the master cylinder and secondary Piston components using denatured alcohol before inspecting for damage or corrosion on the return spring when needed. Replace the master cylinder if you cannot fix the found problems. Put components through non-lubricated filtered air and soak all overhaul components in delco supreme 11® brake fluid or equivalent dot-3 from a sealed fluid pack. Insert both lubricated primary seal and retainer components into secondary Piston and fit the lubricated return spring with secondary Piston assembly into cylinder bore. Set new primary Piston assembly on top before positioning it into place. Use a smooth tool to push down on the primary Piston while installing the new Piston retainer. Put the master cylinder reservoir back in place and place its cap and diaphragm. Return the master cylinder to its original position.