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Old 09-02-2011, 10:34 PM
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Low Brake Pedal

I put a post up a few days ago, but I have more information that might help solving my problem.

Set up:
Under floor power brake set up with remote reservoir in 1956 Ford F100.
7" Booster with 79-81 Buick master cylinder, 1" bore.
Front GM disk brakes.
Rear Chevy drum brakes.

Testing and results:
All with car off.
Rear and Front hooked up. Brake pedal can be pushed almost to the floor.
Rears only, front port plugged, brake pedal barley moves.
Fronts only, rear port plugged, brake pedal can be pushed to the floor.

Based on this there is something wrong with front brake set up.

Strange thing is is that I accidental placed a 10# residual on the front brakes and it had no affect.

I think I have low-drag calipers on the front. How do I get new calipers that I know are not low-drag?

Is there a quick take up that will fit on a 7" booster? I have already tried one from a C10 and S10, both too big.

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Old 09-05-2011, 05:55 PM
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low brakes

Quote:
Originally Posted by MidnightFord
I put a post up a few days ago, but I have more information that might help solving my problem.

Set up:
Under floor power brake set up with remote reservoir in 1956 Ford F100.
7" Booster with 79-81 Buick master cylinder, 1" bore.
Front GM disk brakes.
Rear Chevy drum brakes.

Testing and results:
All with car off.
Rear and Front hooked up. Brake pedal can be pushed almost to the floor.
Rears only, front port plugged, brake pedal barley moves.
Fronts only, rear port plugged, brake pedal can be pushed to the floor.

Based on this there is something wrong with front brake set up.

Strange thing is is that I accidental placed a 10# residual on the front brakes and it had no affect.

I think I have low-drag calipers on the front. How do I get new calipers that I know are not low-drag?

Is there a quick take up that will fit on a 7" booster? I have already tried one from a C10 and S10, both too big.
You didn't mention so I will ask did you put a proportioning valve on it? They are used when using disc., and drums brakes. You also might have too small a bore, on M/C.

Bob
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Old 09-05-2011, 10:29 PM
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Yes, i have a proportioning valve. I believe my problem is either two small of a master cylinder bore (right now 1") or I have the zero drag calipers, or maybe both.
Based on the casting numbers, it looks like my calipers are off of a '81 C10 pickup, but they were also on many other vehicles in the early 80's. Maybe if I get some late 60's early 70's calipers it will help?
Also, any one know of a 1 1/8" bore master cylinder that will fit a 7" brake booster? Make and year would be helpful so I can get a master cylinder at the local auto parts store.
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