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05-13-2016, 10:22 PM | #1 |
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Bleeding using a vacuum can
I picked up a cheap vacuum gun with a cup. Can I plug it onto my bleeder. Pump it up and crack the bleeder? Is this a good way to get the air bubbles out? I searched the site and came up empty. I bleed the system and now I am about 1 inch off the floor. 3 pumps and I am good. But a little low for my comfort. Brand new system on my frame off. 1979
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Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE |
05-13-2016, 11:30 PM | #2 | |
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Re: Bleeding using a vacuum can
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05-14-2016, 09:21 AM | #3 |
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Re: Bleeding using a vacuum can
I have heard of people pressurizing the master cylinder. Figured this is pretty much the same thing
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Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE |
05-14-2016, 09:31 AM | #4 |
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Re: Bleeding using a vacuum can
Probably. I like the cup because there is no mess and you can see when the bubbles disappear. You can use the cup even if you have a person in the cab pumping the pedal, check the reservoir often because it is easy to suck it dry.
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05-14-2016, 10:20 AM | #5 | |
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Re: Bleeding using a vacuum can
Quote:
You can build a pressure bleeder using a weed sprayer, master cylinder gasket, and a chunk of plastic cutting board with all-thread and wing nuts or dog chain, J-bolts, and wing nuts to hold it on the MC. When I made mine the Motive Products units were too rich for my blood. The Motive Products #105 GM unit is just under $70 on Amazon now. A weed sprayer is $15-$20 and air pressure gauges are $5-$15 at the hardware store. The other misc parts could add up to near what the Motive unit costs now... not to mention your time. Do your homework before you commit to building one rather than slapping down some cash. I use empty 2Litre pop bottles as catch cans. Make the clear bleeder hose long enough to just set em on the floor. My read on this is... You can get it done now or waste a bunch of time screwing around with stuff that might work. Pressure bleeding works.
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And please let us know if and how your repairs were successful. |
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05-14-2016, 10:41 AM | #6 |
At the body shop.
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Re: Bleeding using a vacuum can
Unless the proportioning valve kicked over, couldn't get mine to center had to take it apart and push it back.
The joys of 40+ year old junk.
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05-14-2016, 10:45 AM | #7 |
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Re: Bleeding using a vacuum can
They won't bleed at all with a tripped combination valve. No matter what method you choose.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
05-14-2016, 11:27 AM | #8 |
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Re: Bleeding using a vacuum can
No tripped valve. All brand new system. But my peddle is about 1" off the floor. A little close for my comfort. 3 pumps and I am up. I may have a leak. That will also be looked into
Thanks
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Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE |
05-14-2016, 11:57 AM | #9 |
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Re: Bleeding using a vacuum can
A low pedal may also be improperly adjusted drum brakes - check those first since it's an easy fix. You want slight drag against the drum.
I like to bleed with this, and 25' of vacuum line. Hook the vacuum line to one spigot, and the other end to manifold vacuum, and the engine sucks the fluid out for me. Very quick.
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05-14-2016, 08:45 PM | #10 | |
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Re: Bleeding using a vacuum can
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05-15-2016, 11:22 AM | #11 |
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Re: Bleeding using a vacuum can
I put the unit on the rear brakes. Got a little fluid out but not much. Adjusted them a little. Could not get the unit to fit on the front bleeders. Will see how it runs now. If I need to do it again I think I will dig up a pressure system with a weed sprayer and see how that works
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Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE |
05-15-2016, 07:30 PM | #12 |
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Re: Bleeding using a vacuum can
Brakes work 10 times better now. I would say that are perfect but don't want to jinx it
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Chris _______________________________ 1979 Chevy Stepside SPORT 2018 Chevy Silverado, 39 years apart My build 2008-2016. http://m.imgur.com/a/bURrE |
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