Re: Power booster checking
[Re: 469runner]
#3069517
08/19/22 11:45 AM
08/19/22 11:45 AM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
OP
master
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OP
master
Joined: Jan 2004
Posts: 8,637
fredericksburg,va
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Run a hose from the check valve to a vacuum source on a running engine. Depress the pushrod that links to the brake pedal. It should go in easily and return fully as well. You'll hear if there is a vacuum leak, and it most likely will not work either. So no way of checking without hooking up to another engine?
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Re: Power booster checking
[Re: Andrewh]
#3069524
08/19/22 11:55 AM
08/19/22 11:55 AM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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fredericksburg,va
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sure a vacuum pump if you have one. you have to apply vacuum to it to test. IF I could get a long hose up to DC.. plenty of vacuum up there.
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Re: Power booster checking
[Re: TJP]
#3069728
08/19/22 10:03 PM
08/19/22 10:03 PM
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Joined: Jan 2004
Posts: 8,637 fredericksburg,va
cudaman1969
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OP
master
Joined: Jan 2004
Posts: 8,637
fredericksburg,va
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sure a vacuum pump if you have one. you have to apply vacuum to it to test. IF I could get a long hose up to DC.. plenty of vacuum up there. i have pulled a vacuum on more than one booster with a hand held vacuum pump. really doesn't take that long I have a mighty vac, I’ll give it a try
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Re: Power booster checking
[Re: cudaman1969]
#3069731
08/19/22 10:13 PM
08/19/22 10:13 PM
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Joined: Jan 2004
Posts: 1,254 North Carolina
469runner
pro stock
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pro stock
Joined: Jan 2004
Posts: 1,254
North Carolina
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I have a mighty vac, I’ll give it a try
You'll have arms like Popeye when you are able to pull that much vacuum with one of those.
Last edited by 469runner; 08/19/22 10:13 PM.
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Re: Power booster checking
[Re: cudaman1969]
#3069827
08/20/22 11:20 AM
08/20/22 11:20 AM
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Joined: Jan 2003
Posts: 15,829 Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,829
Omaha Ne
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sure a vacuum pump if you have one. you have to apply vacuum to it to test. IF I could get a long hose up to DC.. plenty of vacuum up there. i have pulled a vacuum on more than one booster with a hand held vacuum pump. really doesn't take that long I have a mighty vac, I’ll give it a try let us know if it works. it did for me providing the booster doesn't have a large leak. Obviously with a smaller leak it will create a vacuum but not hold it. Do verify your hose connections / adapters are not the source of the leak. I normally pull the check valve from the booster, block it, pull a vacuum and verify that it holds. reinstall and pump away. Depending on the size of the booster and the pump will dictate how many pumps /long it will take
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Re: Power booster checking
[Re: cudaman1969]
#3069879
08/20/22 01:39 PM
08/20/22 01:39 PM
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Joined: Sep 2003
Posts: 20,235 north of coder
moparx
"Butt Crack Bob"
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"Butt Crack Bob"
Joined: Sep 2003
Posts: 20,235
north of coder
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i have a vacuum pump that i use for ac systems. it works good for a lot of applications, including testing brake boosters. i have a ball valve on the hose, so when vacuum is applied according to the gauge, i close it. if it holds, it's good. if not, it's repair time. i also have a mity-vac and another hand operated vacuum pump. those DO make you get Popeye arms pumping a booster, even the small ones.
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