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Old 03-21-2004, 07:00 AM
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Electric Vacuum Pump

I am unable to obtain enough vacuum to accomodate my power booster. I barely get 18 inches so I opted for a electric pump and purchased one off e-bay. The problem is that the pump does not have a automatic on/off switch to maintain a constant vacuum and it will run all the time. I am considuring to wire it to my brake switch which would turn it on when the brakes are applied. Does any one have a suggestion?

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Old 03-21-2004, 07:06 AM
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18 in of vacuum should be plenty for you PB booster. Are you sure your booster is in good shape?

I would think that you electric vacuum pump would take time to build up vacuum. Do you have the time for it to build up in a "panic" stop situation?
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Old 03-21-2004, 07:51 AM
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The power booster is newly purchased from Master Power brakes. Their "tech" says a minimum of 18". The booster gives a little assistance when I first press the brake but then the brake pedal becomes hard. I am not sure how long the booster would maintain vacuum after the pump cuts off and that is part of my problem. If the booster would hold the vacuum for an extended period of time, that would assist in the panic stops.
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Old 03-21-2004, 02:27 PM
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Ditch the pump and go for a vaccum canister. Since you're right on the border line, it will probably solve your problems and be a lot less hassle.
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Old 03-23-2004, 10:29 AM
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i can only relay what works for me.. HYDRABOOST,

If you for some unexplainable reason hate hydraboost then get an alternator from a diesel, many of them has an integral vacum pump
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Old 03-26-2004, 09:23 PM
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You should be able to find a vacuum switch that will cycle your pump. A friend of mine demonstrated his today and it cranked up when he turned the ignition on and shut off before he cranked the engine so I know they are available and you should be able to find one. I would start with a phone call to Summit. The switch does not care what brand of pump you have or visa versa.

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