Brake problem
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Senior User
Joined: Feb 2000
Posts: 125
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From: Coker Creek TN
Brake problem
For three years now I've had this problem and I can not get a answer to what the problem is, even the so called pro brake shops don't know. So first heres the info on the system, 63 F-100, front disc, rear drum, differential valve, booster and master from a 79 Ford Wagon, front rotors from the same, calipers are from a big GM car, rear are stock, also have a Wilwood adjustable p-valve inline to the rear. ALL parts are NEW except the rebuilt calipers.
Now the problem, I can drive for weeks and it won't happen, then all of a sudden it does, when I ve been driving and come to a stop, get out and come back and go to back up the pedal will go all the way to the floor, really scary! all I have to do is pull the pedal back up and the brakes work fine again. I've tried several master clys and its the same. ANY ideals? Its never done it going forward. Thanks
Robert
Now the problem, I can drive for weeks and it won't happen, then all of a sudden it does, when I ve been driving and come to a stop, get out and come back and go to back up the pedal will go all the way to the floor, really scary! all I have to do is pull the pedal back up and the brakes work fine again. I've tried several master clys and its the same. ANY ideals? Its never done it going forward. Thanks
Robert
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Joined: Dec 2004
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Just some ideas ..... This somehow sounds heat related, have you backtracked the same trip and checked to see how hot your calipers are or the back plates in the rear?
I do know the springs in the back can get hot enough to lose their tinsel strenght as in they might not be compressing the rear cyls. all the way to push the fluid back.
Also have you tried backing the MC rod so it doesn't travel as much? It just seems like your fluid is getting to hot somewhere.
I do know the springs in the back can get hot enough to lose their tinsel strenght as in they might not be compressing the rear cyls. all the way to push the fluid back.
Also have you tried backing the MC rod so it doesn't travel as much? It just seems like your fluid is getting to hot somewhere.
Thread Starter
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Senior User
Joined: Feb 2000
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From: Coker Creek TN
Richard, thanks for your reply, just wondering, if the fluid is getting to hot, why is it just doing it when I back up? Will check the rear springs, I agree with the idea that something is not pushing the fluid back.
Thanks
Robert
Thanks
Robert
Post Fiend
Joined: Jun 2002
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From: Atlanta GA
> when I ve been driving and come to a stop, get out and come back
> and go to back up the pedal will go all the way to the floor, really scary!
Could be your brake booster is bad.
Could be after you park, the rotors are so hot, without the truck moving with no air flow, the brake fluid boils.
Could be your rear brakes are not adjusted correctly and are dragging.
Your stock brake lines run very close to the exhaust manifold. Make sure you have at least three inches between the lines and the engine or its exhaust manifold.
What you need to do is drive around, park the car, and feel if your wheels are getting very hot. Do not try to touch the rotors, I guarantee a burn if you do. If the front wheels or back drums are too hot to touch, you have a problem on that axle.
Look to see if you have cracks in your pads or shoes.
> and go to back up the pedal will go all the way to the floor, really scary!
Could be your brake booster is bad.
Could be after you park, the rotors are so hot, without the truck moving with no air flow, the brake fluid boils.
Could be your rear brakes are not adjusted correctly and are dragging.
Your stock brake lines run very close to the exhaust manifold. Make sure you have at least three inches between the lines and the engine or its exhaust manifold.
What you need to do is drive around, park the car, and feel if your wheels are getting very hot. Do not try to touch the rotors, I guarantee a burn if you do. If the front wheels or back drums are too hot to touch, you have a problem on that axle.
Look to see if you have cracks in your pads or shoes.
Senior User
Joined: Dec 2004
Posts: 243
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From: Bremerton, WA (Seattle)
Where is the master located on the car? If its lower then the rest of the lines/system, like under your floor then you need to have some residual check valves in your lines.
I would also suspect the booster to like rebocardo said.
I will check my BIG brake book when I get home. Sounds odd. Wonder if maybe your master is getting heated and the O-ring is letting fluid by? Do you lose fluid out of the system at all?
- Joe
I would also suspect the booster to like rebocardo said.
I will check my BIG brake book when I get home. Sounds odd. Wonder if maybe your master is getting heated and the O-ring is letting fluid by? Do you lose fluid out of the system at all?
- Joe
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Joined: Dec 2004
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You do say" also have a Wilwood adjustable p-valve inline to the rear. "
Where is it located and for my info. just how do you adjust it? Does it adjust to the linear feet of brake line and size and or volumn of the clys. Can it get debris in it to restrict low pressure back-flow?
By the way, my first car was a 63 Ford Fairlane with a 221cid V8.
With 1st gear syncronized, WOW! Richard
Where is it located and for my info. just how do you adjust it? Does it adjust to the linear feet of brake line and size and or volumn of the clys. Can it get debris in it to restrict low pressure back-flow?
By the way, my first car was a 63 Ford Fairlane with a 221cid V8.
With 1st gear syncronized, WOW! Richard
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Thread Starter
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Senior User
Joined: Feb 2000
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From: Coker Creek TN
Well, I've checked all the things you guys have pointed out, no luck. Guess I'll just not back up!!! Thanks
Robert
Robert
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