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#1 |
Registered User
Join Date: Mar 2009
Location: WARRENSBURG,MISSOURI,64093
Posts: 1,518
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Hello all! I just wanted to share an idea I got from the internet. I read where Audi A4's and a lot of Volkswagen cars had electric Vacuum pumps for their vacuum assisted brakes.
I visited my local Pick n pull yesterday after work, found one on a 2003 Audi A4, paid $26.00 and headed home. I brought it into work this morning, cut the hose barb off the business end, threaded it for 1/8" NPT and hooked up a vacuum gauge, then connected the leads to one of my De Walt batteries to test it, this little Sucker (Pun Intended ![]() Have a good one! Ben ![]()
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"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" ![]() “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten” |
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#2 |
Registered User
Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,332
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Re: solution to power brakes for engines with "lumpy" cams
Cool! I guess the only downside would be how often it can make enough vacuum to satisfy the brakes.
Heck that's a cheap source for a vacuum pump in general, I'm sure I paid a lot more than that for one to vacuum down my AC system!
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1970 GMC Sierra Grande Custom Camper - Built, not Bought 1969 Pontiac 2+2 427/390 4-speed Coupe 1969 Pontiac 2+2 427/390 4-speed Convertible |
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#3 |
Senior Member
![]() Join Date: Jul 2000
Location: North Texas
Posts: 3,501
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Re: solution to power brakes for engines with "lumpy" cams
Will be interesting to see if it works. I guess it will depend on how much the booster volume decreases the vacuum when brakes are applied.
Dave, an AC vacuum pump needs to pull 29" vacuum to boil moisture at temperatures less than 80 degrees F, so they typically cost more. The really good (and expensive) ones will approach or exceed 29.9".
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Mike 1969 C10 LWB -- owned for 35 years. 350/TH350, 3.08 posi, 1st Gen Vintage Air, AAW wiring harness, 5-lug conversion, 1985 spindles and brakes. 1982 C10 SWB -- sold 1981 C10 Silverado LWB -- sold, but wish I still had it! 1969 C10 (not the current one) that I bought in the early 1980s. Paid $1200; sold for $1500 a few years later. Just a hint at the appreciation that was coming. Retired as a factory automation products salesman. Worked part-time over the years for an engine builder and a classic car repair shop. Member here for 24 years! This is the very first car/truck Internet forum I joined. I still used a dial-up modem back then! Last edited by MikeB; 05-02-2016 at 12:56 PM. |
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#4 |
Registered User
Join Date: May 2012
Location: Ingersoll, Ontario
Posts: 93
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Re: solution to power brakes for engines with "lumpy" cams
Maybe with a canister if the pump doesn't have the volume.
Interested to hear how it works. Will the pump run all the time? How noisy is it? |
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#5 |
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Join Date: Jul 2007
Location: Fall River California
Posts: 2,026
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Re: solution to power brakes for engines with "lumpy" cams
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#6 |
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Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,191
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Re: solution to power brakes for engines with "lumpy" cams
Does that have a pressure regulator built in? It should only cycle occasionally when the vacuum goes below a certain limit. It should also stop when the max vacuum is achieved. Otherwise, that pump will wear out from continuous use.
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#7 | |
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Location: Fall River California
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#8 | |
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#9 |
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Join Date: Mar 2009
Location: WARRENSBURG,MISSOURI,64093
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Out in the open it's kind of noisy, but I think once it's installed and plumbed up to the tank and booster shouldn't be too noticeable. Here is a couple of pics...
Ben ![]()
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"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" ![]() “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten” |
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#10 |
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Join Date: Mar 2009
Location: WARRENSBURG,MISSOURI,64093
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Re: solution to power brakes for engines with "lumpy" cams
Another...
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"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" ![]() “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten” |
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#11 |
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Join Date: Sep 2013
Location: Gonzales, La
Posts: 1,441
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Re: solution to power brakes for engines with "lumpy" cams
Sweet idea. Thanks for sharing.
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MyToys: Goldilocks the "Ol School Survivor" 1968 C10, SWB Stepside, 08/15 TOTM, 250 CI 6 cylinder, 3 on the tree, 3.73 rear, 3/5 static drop, 23,500 original miles. Samson the 1970 CST10, LWB, 462Ci, Turbo 350 tranny, 3.08 rear gear, PB, PS, A/C, AM/FM, 2/4 Drop. Brutus the 1998 Camaro Z28, 33,500 original miles, LS1, 519 RWHP/497 RWTQ. Member of the Louisiana Classic Truck Club, LCTC Member of the Louisiana C10 Club Member of the Baton Rouge Drifters Car Club |
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#12 | |
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Join Date: Jul 2007
Location: Fall River California
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#13 |
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Join Date: Mar 2009
Location: WARRENSBURG,MISSOURI,64093
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well, I have yet to try it out, but I did get an adjustable vacuum switch, cycles the pump on at 18 inches of vacuum, just haven't had time to test it out on the truck yet. I made a Vacuum accumulator out of a 5 pound oxygen bottle, couple that with all the braided hose I should have quite a good vacuum supply.....
![]() Ben ![]()
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"Persistence is the twin sister of Excellence.one is a matter of quality,the other, a matter of time" ![]() “Serious Black” my 1971 Short Bed Fleetside Sold to an outstanding man in Lees Summit,Mo. “Gone, but by no means,Forgotten” |
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