Dorman M630035 Brake Master Cylinder - New Replacement Part for Enhanced Performance Review

Much cheaper than the local auto parts store. Arrived quickly and fitted perfectly in my 2002 GMC Sierra 2500hd 6.0L. No problems since installation.

Arrived very quickly, great part, well packaged! You need a bleed kit for the master brake cylinder and that's it. This solved my soft brake pedal issues, installed the part and flushed out all the brake fluid in about an hour! Highly recommended

It literally took longer to bleed the brake system than to install the master cylinder. It also has a monitor connector on the bottom just like the OEM so everything lines up perfectly. I assume the plug is for checking the level of liquid in the tank. I prebled with a Dorman 14151 bleed kit; This is the kit you need as it has TWO connectors of each size. I also needed a 15mm box wrench to remove and reinstall the two air lines. The two bolts that attach the master cylinder to the firewall were