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Old 06-23-2002, 09:14 AM
mac mac is offline
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Post Brake Booster

I put a set of webers on my 34 ford 350 chevy,mustang front and rear. I installed a electric pump for the brakes because of low vacuum. the pump has an inlet screen and an exhaust barb fitting. I hooked up the exhaust to the booster and now I can hardly push the brake pedal down. I know a carb sucks air from the booster but how is this supposed to work? madmacs34@earthlink.net madmacs34@earthlink.net
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Old 06-23-2002, 09:26 AM
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Lightbulb

Maybe the inlet side of the vacuum pump should have been connected to the booster.
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Old 06-26-2002, 04:42 PM
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I think that SJFast has a point, why would there be a screen on the end where air is coming out? It should be simple to figure out, the booster should be connected to the side that sucks not exhausts. It is intended to give you assistance in pushing the rod into the master cyl. You may be pressurizing the booster that will be fighting against you instead of helping you.

Heres my 2 cents on how I think that it works. Inside of that magical can called a booster is a big plastic diaphram with a rubber seal and a big spring (had one rebuilt). My thought is that the spring and brake rod pressure is slightly stronger than the vacuum that it takes to suck the diaphram towards the fitting. When you push on the brake pedal, the vacuum is drawing the diaphram towards the front, taking your brake rod with it into the master cylinder. The diaphram is 7 or so inches round and I guess increases your mechanical advantage. Careful, don't ruin the booster..their $80 if you can match it up.

[ June 26, 2002: Message edited by: HotRodF100 ]</p>
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Old 06-26-2002, 06:07 PM
mac mac is offline
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F-100 I guess I didn't make myself clear. The screen was on the inlet side(sucking). The exhaust end had the barb. I knew the booster had to have suction so I was puzzled as to why the pump was advertized as a vacumm pump. I took the screen and filter off, put a different fitting on and attached the hose to it and the booster. It works but I wonder if this was the intent of the pump. As i said I'm going to run it this way and see if the pump holds up. Theres nothing dangerous abouy it as you still have brakes if the pump fails,it just takes more pressue to press the pedal. Thanks for the reply and help. madmacs34@earthlink.net
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