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Old 06-19-2002, 10:30 AM
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Red face Power brakes~vaccum pump

A Crane cam tech.rep.told me that some 4 cyl.Chevetts had a low vaccum problem,and as a fix Chevy factory installed a electric vaccum pump to operate heater vent doors.
Trouble the tech.guy couldn't remember what years Chevette used the pump.The pump is down and dirty way to run power brakes on a Big cam motor.Can you tell me what yrs.this pump was used on Chevette and if it had any valves or switches that controled it ?
reply to : plysat65@webtv.net
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[ June 19, 2002: Message edited by: plysat ]</p>

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Old 06-19-2002, 02:31 PM
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I picked up a 12 volt vacuum pump on eBay (I have no idea what it came from) for fifty bucks. I hooked it up to a cannister, battery, and a gauge and it pumps 18" of vacuum almost instantly. It sounds like what you're looking for.
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Old 06-20-2002, 03:31 AM
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Try a 99 and later ford f350 diesel vac pump. part# f81z-2a451-ba
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Old 06-21-2002, 08:35 AM
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A very good vacuum system can be found on the mid 80's FWD Caddy Seville. They have a vacuum system that is "T" ed into the normal power booster. When vaccum lowers from the booster, a pressure switch mounted on the booster actuates a +12 volt pump that supplies additional pressure. A indicator light will illuminate on the dash panel and show "BRAKE" with a brake shoe symbol. The early versions on the RWD Caddy used a belt driven pump pulled by the crank pully system. The +12v one is self contained and is a better one. I find these in the recyle yards for about $10.00 or less. I take the complete system that consist of: vacuum booster pressure switch, +12 volt pump, wire harness, vacumm hoses and "T" fittings and the pump mounting bracket. The cars that have the system can be easily spotted by looking at the vac booster and you will see a switch with a two wire connector attached on the left side, opposite the normal vacuum hose and fitting on the right side of the master cylinder. This is a GM system and is covered in the GM shop repair manual. A pump is also offered by Jeg's I think. I only saw the pump and no fitting listed. The recycle yard is a good way to go for one needing a set up like this. I think that not all of the parts a needed and can be eliminated to suite your application and requirements. Let us know what you think and find. Hope this helps!
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Old 06-21-2002, 06:19 PM
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this is yet more good news on the list.turns out what I was looking for wasn't used on a Chevette,but a Cavalier(82) & pt # was 22034995 can't find one new yet,but I'm still looking,may be the old junk yard
Saturday to find one.Local Chev. dealer says pt.# also used on GM x~bodys 82-85 w/2.8L v-6.So with your info. and another reply that listed some Chry. pt.#'s I should be OK~~~~~~~ THANKS TO ALL !!

[ June 21, 2002: Message edited by: plysat ]</p>
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Old 12-18-2002, 10:21 AM
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How many inches of vacuum is required to operate power brakes?
I just started my new sroker motor and I have 9" of vacuum at 750 rpm
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Old 12-21-2002, 12:07 AM
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[quote]Originally posted by Ron Parr:


How many inches of vacuum is required to operate power brakes?

I just started my new sroker motor and I have 9" of vacuum at 750 rpm<hr></blockquote>

18" minimum.

-MPB Vacuum Pump-
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