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Old 02-05-2006, 06:33 PM
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Brake Problem

I got my rod running today! While checking everything out I found a strange problem with the brakes. With the engine running they do not return when depressed. They are fine when the engine is not running and the calipers are responding so It must be in the brake booster. The system is an aftermarket under the floor system with a corvette style master cylinder hooked to 4 wheel disk brakes with residual valves on both lines. I believe the boster is a dual 7". It is hooked up directly to the intake manifold. Any ideas? Do the under the floor models require a pedal return spring? Any help is appreciated.


Mike
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Old 02-05-2006, 08:56 PM
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Gonna need more info on this..

Do the brakes release when you let off the pedal?

Yes there needs to be a return spring on the pedal, somewhere.

I'm sure that there is a proper spot & tension for this but that is out side my knowledge .

Does the car stop ? & good?


R
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Old 02-05-2006, 09:59 PM
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If the problem is evident only with the engine running, then check the vacumebooster configuration. You may have a vent with the shipping plug still in it. Apparently, ambient air must be used to help return the pedal.

Another possibility is the vent valve is stuck so that the vacume used to provide assist is not being released. It all depends on the configuration of your power booster, as there are a few different ways to design a booster.
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Old 02-06-2006, 12:00 AM
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Just my .02 Cents

Iv'e read several post involving the lenght of the pushrod between the pedel and booster. If it's too long, it won't let the M/C fully return. Just a thought.
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Old 02-06-2006, 07:06 AM
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Another thing to remember too is that the bigger the reservoir for the master cylinder the less pressure there is to the pads thus, the smaller the reservoir the more pressure to the pads
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Old 02-06-2006, 12:30 PM
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"Another thing to remember too is that the bigger the reservoir for the master cylinder the less pressure there is to the pads thus, the smaller the reservoir the more pressure to the pads "

I belive it's the M/C bore size that changes the pressure.
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Old 02-06-2006, 06:45 PM
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brake problems

Yes the brakes are releasing. I cannot yet drive the car so I do not know how good they are at stopping. The problem is that once depressed the pedal stays down. Its like once you push the pedal once you can move it in and out a couple of inches. Shut off the car and it returns to normal. I will try adjusting the linkage arm and see what effect that has.


Thanks,

Mike
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Old 02-06-2006, 07:30 PM
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" The problem is that once depressed the pedal stays down. Its like once you push the pedal once you can move it in and out a couple of inches. Shut off the car and it returns to normal."

What you are telling me is that when engine Vacuum stops, the pedal returns. Looks like "techntool" could be on the right track. I'm not sure of your booster, but several have a perforated rubber boot around the clevis pin. Behind that is an air filter that lets air into that side of the booster. Could that be blocked?
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