OEM 2009 GMC Envoy Brake Master Cylinder

2009 GMC Envoy Brake Master Cylinder Parts and Q&A

• Q: How to replace the brake master cylinder on 2009 GMC Envoy?

  A: To prepare for the Brake Master Cylinder replacement you should push then release your Brake Pedal repeatedly until it becomes stiff to empty the vacuum reserve of a power vacuum Brake Booster. Empty the brake fluid from the Brake Master Cylinder reservoir with a proper tool and place it in an authorized storage unit. Unplug the master cylinder sensor electrical connector and take off the secondary brake pipe fitting from the master cylinder. Use fitting caps and plastic plugs to seal and protect brake lines from fluid loss. You must detach the master cylinder primary brake pipe fitting then secure it with a cap and stop the outlet port's access. Unfasten the master cylinder nuts and take out the master cylinder . After that remove the o-ring seal from the master cylinder. Position properly the o-ring seal in its groove on the power vacuum Brake Booster before installing the master cylinder into the booster with the master cylinder first and then the o-ring seal. Fasten the master cylinder nuts with a torque setting of 36 nm (27 lb ft). Join the secondary brake pipe to the master cylinder with 32 nm (24 lb ft) torque and then link the master cylinder primary brake pipe with 32 nm (24 lb ft) torque as well. Complete the system by joining the master cylinder fluid level sensor wiring and running hydraulic brake fluid through the network.