| Stumped on brakes - hard pedal very little braking [message #225631] |
Mon, 14 October 2013 15:20  |
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Been a long time since I have posted and of course looking for some advice on my brakes.
GMC has been sitting way too long, about 1 year with very little use. Went in to move it out of the shelter and brake pedal went to the floor. The front chamber of the master cyl was almost empty and I really pushed to far so I replaced the master cyl. When bleeding the brakes I found a rear brake cyl leaking so I replaced it and went on to bleed all the brakes. Brake bleeding went well and when done with the engine running the pedal was very hard to push to get much braking at all. I figured maybe the brake booster had gone bad so replaced with new sensitized version with the modified rod from Jim Bounds. Got that all in and the same problem very hard pedal very little braking. Good vacuum to the booster so that should be good to go. I have the standard OEM brake setup no modifications except for sensitized booster have been made to the system and it has always worked pretty well.
So, that is where I am at and stumped can't figure what else it might be so hopefully I can get some suggestions of my next step.
Thanks
Bob & Terry Stockholm
Xenia, OH
1976 PB
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