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Author Topic: Hard Brake Pedal...  (Read 2255 times)

Offline 82GMC_JIMMY_6.2D

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Hard Brake Pedal...
« on: November 28, 2010, 11:04:09 pm »
Hi my name is Andy and Im new to your forum but have found advice here before from reading other posts. I just recently purchased a 82' GMC Jimmy 6.2L Diesel 700R4 (newly rebuily) 4x4.  The brake pedal is hard as a rock and is difficult to stop, the cruse control also slowly falls off of the set speed.  I have heard that there are vacuum pumps on these motors and there are also hydro boost systems.  Does any one know which one is to blame and if this is a common problem with the diesel?  The truck has only 58,000 original miles on it so there may be some seals or o-rings that have hardened. Thanks for your time and consideration.
andy
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Offline Irish_Alley

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Re: Hard Brake Pedal...
« Reply #1 on: November 28, 2010, 11:30:11 pm »
to me sounds like there is no vacuum at the booster if you have one. and the cruise i would think its also a vacuum problem i would check your hoses for any cracks and such.
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Offline Captkaos

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Re: Hard Brake Pedal...
« Reply #2 on: November 29, 2010, 05:18:22 pm »
what kind of booster do you have?  Vacuum or Hydraulic.  Vacuum has a big round cannister behing the master cylinder, hydro has hoses going to the steering box.

Cruise drops speed because it is garbage, they never worked.
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