Brake problems

Tiny
NOMANSLAND
  • MEMBER
  • 1961 GMC
  • 100,000 MILES
I'm having brake problems with my 1960 GMC 3500 2 ton truck. I just got it from a neighbor and he had just put a new master cylinder on it. It's the duel type, one side for clutch the other from brakes. I put a new booster on it under the cab and bleed the brakes per the place I got the booster, starting with the master cylinder on the booster and them each wheel individually but it still almost takes both feet to push the brake pedal. Also, it takes 3 pumps before the pressure builds up and the pedal doesn't go all the way to the floor. I might also add that I disconnected the vacuum line at the booster with the engine running and it seems to have plenty of vacuum. I also connected a hand held vacuum pump that I have to the inlet on the booster and pumped it up. I put my finger on the inlet after pumping it up and it held vacuum until I released it which I'm guessing means the booster isn't leaking off.
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Wednesday, May 1st, 2013 AT 4:20 PM

4 Replies

Tiny
ASEMASTER6371
  • EXPERT
First, it sounds like a bad booster. Was it new or used booster?

As far as the pedal, get the booster fixed first and then you need more bleeding starting at the right rear wheel.

Roy
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Wednesday, May 1st, 2013 AT 5:26 PM
Tiny
NOMANSLAND
  • MEMBER
It is a rebuilt booster from a brake and clutch shop.
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Wednesday, May 1st, 2013 AT 6:05 PM
Tiny
ASEMASTER6371
  • EXPERT
Ok, new or used part?

Roy
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Wednesday, May 1st, 2013 AT 6:07 PM
Tiny
NOMANSLAND
  • MEMBER
Well, I'm assuming it was a used part to the rebuilding company. Isn't that how it works?
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Thursday, May 2nd, 2013 AT 10:46 AM

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