PDA

View Full Version : C6 Master, Brake Lock-Up



hookemdevils22
10-07-2016, 08:30 PM
I just installed C6 Z51 brakes on the front of my Nova, to go with LS1 rears. I also installed a MY2006 C6 booster and master cylinder, with a modified push rod to fit my brake pedal.

I took it out to bed the pads, and found my front brakes nearly locked up when I got back to the garage. I jacked the front up and couldn't turn the tires, though was able to drive it in the garage. I didn't check the rear.

I initially thought it was my line lock, but I was able to free the brakes by unbolting the master from the booster. I checked the clevis, and it isn't pushing the vacuum booster, and I double-checked that I didn't plumb the line lock backwards. it seems like the pushrod for the master cylinder itself is too long, but that makes no sense since they came off the same car.

I connected the rear master cylinder port to the line lock, then to a T to the front calipers. The front port goes to the rear by way of a Wilwood proportioning valve. I was told that the C6 is plumbed the same as the C5.

So what did I do wrong here?
EDIT: I just went out and checked the push rod length. I forgot I had lengthened it last night when I was having issues bleeding the rears. It may have been too long.

Josue
10-08-2016, 06:31 PM
I had a similar problem with my C5 master cylinder. One day, it decided to not lock up, but still apply the brakes to the point where I was almost full throttle just to keep the car moving! I was only minutes away from home, but in that time I could see a bluish tint to my rotors from the heat!

It felt like I couldn't push the brake pedal, hard as a rock. It was also like something inside the booster was applying the brakes for me. (obviously) My fix was simply to get a new booster, since the master/booster combo came from a salvage yard. Maybe when the person in the C5 it came out of got into the wreck, they had their foot on the brakes and blew the booster out?

hookemdevils22
10-09-2016, 06:54 PM
I adjusted the pushrod length and didn't have an issue with the brakes this morning. Seems that was the issue.