OEM 2004 Cadillac XLR Brake Master Cylinder

2004 Cadillac XLR Brake Master Cylinder Parts and Q&A

• Q: How to service and repair the Brake Master Cylinder on 2004 Cadillac XLR?

  A: Place the Brake Master Cylinder flange in a bench vise correctly making the back of the primary Piston visible. Put suitable flare-seat fitting connections on the master cylinder ports after you take out the diaphragm and reservoir cap. The fittings need to match the hoses. Seal these fittings by attaching transparent hoses and placing their ends into the master cylinder reservoir. Add delco supreme 116 (GM P/N 12377967, Canadian P/N 992667) dot-3 brake fluid up to the middle mark of the reservoir from a sealed fluid can, placing the hose ends fully in the fluid. Press the Piston with a rounded tool then release it up to 25 mm (1 inch) multiple times to check fluid flow from the ports. The resistance increases as you push the primary Piston deeper because you release compressed air from this Piston suite. Press the primary Piston multiple times while monitoring port fluid stream for bubbles until the ports deliver fluid easily without air bubbles. After fluid movement ends put the hoses back into the reservoir space and replace the master cylinder cap before disconnecting each port connection piece and laying the master cylinder onto absorbent material.