OEM 2007 GMC Envoy Brake Master Cylinder

2007 GMC Envoy Brake Master Cylinder Parts Questions & Experts Answers

• Q: How to remove and replace the brake master cylinder on 2007 GMC Envoy?

  A: Before servicing the Brake Master Cylinder always keep safety in mind by knowing about brake fluid reactions and its effects on brake fluid and electrical systems. Start work by removing the Brake Master Cylinder from the vehicle. Clamp the mounting flange into a workshop vise to let you access the back of the main brake Piston. Before beginning work clean the space near the reservoir cap and remove both components together with the diaphragm. Check for damage on the reservoir cap and diaphragm before replacing them with new parts. You should disconnect the master cylinder reservoir next. With a smooth round tip depress the primary Piston and take off the Piston retainer. Then remove the primary Piston components. Insert air filters into all ports on the cylinder while supplying filtered low-pressure air through the front outlet to push out both secondary and primary components with their return spring. Throw away the primary Piston parts together with the Piston retainer and seals. Clean and examine the master cylinder, return spring and secondary Piston using denatured alcohol alongside maintaining a visual check for damage or wear. If damage is present completely replace the master cylinder. Place wet components in compressed non-lubing filtered air and add delco supreme 11 lubricant into the master cylinder initially with secondary Piston and return spring before fitting all new parts. Place new primary and secondary seals together with the retainer onto the secondary Piston. Add the lubricated return spring and secondary Piston assembly into the cylinder bore. Fit and secure the new lubricated primary Piston assembly into its place with the Piston retainer. Put back the cylinder reservoir before attaching its cap and diaphragm then put back the entire master cylinder system.