I had completely redone all the brakes on the GMC 370, everything new, lines, mc, shoes, new hydrovac, wheel cylinders, except the 4 on the rear. At the time I could not find a part number for them. They didn't look too bad, so I honed them and put new washers.
Brakes were great. But after some time and puttering around the place in it, one of the rears began to leak. So I did find new ones at NAPA. Installed them and when the wife could go out to the farm with me. I had her to pump and I bled the rears. Hoping I would not have to bleed the whole system again.
Well, we got some pedal but not like before. We had to go, so I was going to wait till later to do it all.
Now, here is the kicker. Went today by myself and thought I would go back over the adjustment. Rear end was on stands, no tires. On a whim, I started the engine up and put it in high gear and spun the drums and pumped the pedal a few times. Thinking I would seat the shoes before adjusting again (2 per wheel)
When I went to adjust, the brakes were locked, so I started backing off on the adjusters, still locked.
So I opened the bleeders real quick and back. Walla!!
It bled itself. I proceeded to make the correct shoe adjustment. Put the wheels back on and I have great pedal and perfect brakes. How did it bleed itself?
Last edited by Old GMC Gold; 08/02/2014 12:27 AM. Reason: sp
