power brake problem/??
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Joined: Jun 2000
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power brake problem/??
I have a problem with the brakes on my '72 f100 that I'm hoping someone can help me diagnose.
The truck has factory power drum brakes. Awhile back, I had to hit the brakes hard to stop quickly. The brakes worked fine and I got stopped ok, but the pedal 'went away' (so to speak) and ever since then, the brake pedal goes clear to the floor. They still work and will stop the truck but not nearly as good as before.
My thought is that the power booster is bad since there are no fluid leaks and the brakes still work, just not very well.
Can anyone offer a confirmation or a different diagnosis.
Thanks for the help!!!
The truck has factory power drum brakes. Awhile back, I had to hit the brakes hard to stop quickly. The brakes worked fine and I got stopped ok, but the pedal 'went away' (so to speak) and ever since then, the brake pedal goes clear to the floor. They still work and will stop the truck but not nearly as good as before.
My thought is that the power booster is bad since there are no fluid leaks and the brakes still work, just not very well.
Can anyone offer a confirmation or a different diagnosis.
Thanks for the help!!!
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
power brake problem/??
I see three options:
1. You popped a wheel cylinder, and lost either your front or rear circuit.
2. You popped a brake line, in either the front or rear circuit.
3. You popped seals internal to the master cylinder.
Check your master cylinder immediately! If you are low in one well, check for leaking brake fluid. If you don't find leaking brake fluid, then refill the well, and check your brakes.
If you still have a low pedal, and/or you lose fluid, you need to look real close for a leak somewhere! Don't forget to look for leaking fluid coming out of the rear of the master cylinder. It often isn't easy to see, and can dribble into the booster.
My best guess is that your master cylinder went tango uniform. Get it replaced soonest, or you will not have any brakes at all!
If the booster went bad, then you would have more resistance on the brake pedal to achieve the same braking effect.
Since the resistance is the same, the booster is probably OK, but your master cylinder cannot build up pressure.
Let us know what you find!
Thread Starter
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Senior User
Joined: Jun 2000
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power brake problem/??
I guess I need to clarify - there is no resistance until the pedal gets way down (almost to the floor). Then the brakes grab. That's why I was thinking booster......
I've checked a couple times and fluid levels haven't changed - although I don't drive the truck very often either.
I've checked a couple times and fluid levels haven't changed - although I don't drive the truck very often either.
Logistics Pro
Joined: Oct 2000
Posts: 3,960
Likes: 5
From: All over Texas
power brake problem/??
When my booster went, it made an awful whining/hissing sound. I knew right away it had kicked the bucket. Like Banjo, I'm thinking you have created a small leak somewhere caused from the powerful pressure you exerted on the system with the hard stop.
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