OEM Chevrolet Silverado 1500 Classic Brake Master Cylinder

Chevrolet Silverado 1500 Classic Brake Master Cylinder Parts and Q&A

• Master Cylinder
  19209239
  Q: How to service and repair the Brake Master Cylinder on Chevrolet Silverado 1500 Classic?

  A:

  To fix the Brake Master Cylinder start by fastening its mounting flange in a bench vise to reach its rear. Secure fittings near the master cylinder ports for flare seating that can connect to hoses and remove the diaphragm and reservoir cap. Insert transparent hoses to these fittings then guide them into the master cylinder reservoir. Pour delco supreme ii brake fluid (GM P/N 12377967 or equivalent DOT-3 brake fluid) into the master cylinder reservoir until the liquid reaches half its volume through hose ends that must be completely dipped into the fluid. Press the primary Piston down 25mm using a rounded tool and let it return to its starting position until the fluid flows smoothly across ports. Pressing the primary Piston will become harder and its travel shorter as it pushes air out of the system. Maintain this procedure until brake fluid emerges fully from the openings without air content. Put the master cylinder reservoir back on then connect the end fittings to port openings before taking the master cylinder out from the vise.
• Master Cylinder
  19209236
  Q: How to replace the brake master cylinder (Vacuum Boost) on Chevrolet Silverado 1500 Classic?

  A:

  When working on the Brake Master Cylinder vacuum support you must first activate the parking brake and secure all wheels. Pull out the electrical connection from the brake fluid sensor and pipes from the master cylinder before putting rubber caps on the brake pipe ends to avoid fluid loss and contamination. To remove the system take out the master cylinder by unscrewing the mounting nuts plus extracting the reservoir. Begin by installing the master cylinder reservoir and proceed with master cylinder bleeding on a working surface. If the seal has damage replace it with a new one matching its proper placement against the master cylinder base. Reinstall the master cylinder into its vehicle location then bolt it down with the mounting nuts until they reach 36 nm (27 ft. Lbs.). Join the brake pipes by removing their rubber caps and tightly fasten the fittings with 25 nm torque. Connecting the sensor electrical wires then bleeding the brake system allows you to free the park brake and unblock the wheels.