Brake problems
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Posting Guru
Joined: Jan 2010
Posts: 1,665
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From: Terre Haute, IN
Brake problems
Yea, I know, it's me again...
Problem: When i apply the brake as hard as i can @ 45mph all that happens is a slow steady stop. The booster is 7 months old (Boggs and i suspect it may be bad) and i put a new master on today. I was very thorough in bleeding the lines, so it's not air. When i put my finger over the vacuum line for the booster i feel strong suction.
What could be my possible problems? Could it be a poorly re-manufactured booster? John said that bad calipers are not likely to cause this. Do i just need to go bleed them again?
Help please! I want to drive my truck!
Problem: When i apply the brake as hard as i can @ 45mph all that happens is a slow steady stop. The booster is 7 months old (Boggs and i suspect it may be bad) and i put a new master on today. I was very thorough in bleeding the lines, so it's not air. When i put my finger over the vacuum line for the booster i feel strong suction.
What could be my possible problems? Could it be a poorly re-manufactured booster? John said that bad calipers are not likely to cause this. Do i just need to go bleed them again?
Help please! I want to drive my truck!
Senior User
Joined: Mar 2010
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its an old heavy truck. i dont believe my truck is the weight on my registration as my half ton is heavier. how do your pads look? what vacuum are you pulling? still running the original rubber brake lines? maybe upgrade?
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Posting Guru
Joined: Jan 2010
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From: Terre Haute, IN
Mike, pads are in good shape. I believe my vac pump is good, but i'll test it and see.
My truck is just under 6,000lbs. No excuse for the way it stops. Something is wrong and needs fixed.
My truck is just under 6,000lbs. No excuse for the way it stops. Something is wrong and needs fixed.
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Posting Guru
Joined: Jan 2010
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From: Terre Haute, IN
I sure got kicked off the first page fast.. 
I never got an e-mail from PLC, but i hooked a vacuum gauge up to my brake booster line and it pulled down to 24 in-Hg in about a second, almost instantly. I'm figuring that this means my pump is in great shape.
I'll replace the booster and report back...
I never got an e-mail from PLC, but i hooked a vacuum gauge up to my brake booster line and it pulled down to 24 in-Hg in about a second, almost instantly. I'm figuring that this means my pump is in great shape.
I'll replace the booster and report back...
Postmaster
Joined: Apr 2008
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Your pump is good, yes. Why your truck stops poorly - pads you said are good, but they could be glazed too, I had mine glaze over while riding the brakes in the darn NYC traffic and truck stopped poorly till I actually pulled the pads and sanded them down some. Also rotors and drums are important, are those any groovy?
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From: Terre Haute, IN
The PO said the rear brakes were new hub to hub. Haven't pulled the drums to see.
I'll pull the calipers and check the pads when i replace the hoses tomorrow...
I'll pull the calipers and check the pads when i replace the hoses tomorrow...
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Thread Starter
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Posting Guru
Joined: Jan 2010
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From: Terre Haute, IN
So the pads were glazed a little and one of the calipers has been so hot it burned up the outer rubber boot...
After replacing both front brake hoses and sanding the pads and rotors i'd say i'm at about 80% of normal. I've got much better brakes, but i still feel like the booster isn't working right.
Update after i replace te booster and left caliper...
After replacing both front brake hoses and sanding the pads and rotors i'd say i'm at about 80% of normal. I've got much better brakes, but i still feel like the booster isn't working right.
Update after i replace te booster and left caliper...