Cariboo4x4
Member
Hi All
I am trying to figure out why the vacuum brake booster no longer works on this 1977 GMC 6500. Ive followed the vacuum line to the vacuum booster under the cab to this valve as I call it under the slave cylinder. The slave cylinder is bolted to 2 vacuum pots as I call them. I have yet to crack any of the rusted lines. We have bled the master cylinder and slave cylinder yet the vacuum assist function appears to be not working. I have taken lots of photos. Ive attached a few.
I am trying to figure out why the vacuum brake booster no longer works on this 1977 GMC 6500. Ive followed the vacuum line to the vacuum booster under the cab to this valve as I call it under the slave cylinder. The slave cylinder is bolted to 2 vacuum pots as I call them. I have yet to crack any of the rusted lines. We have bled the master cylinder and slave cylinder yet the vacuum assist function appears to be not working. I have taken lots of photos. Ive attached a few.