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Old Apr 17, 2006 | 09:57 PM
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Default Power Brake Booster
Is there any way to test the power brake booster with it still in the car. I tried to pump it up with a mity vac pump and could never get it into a vacuum. I've got about 10 in of vac. at idle but no power brakes.
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Old Apr 17, 2006 | 10:04 PM
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10 inches is marginal...you may not achieve power brakes unless you correct/raise the vacuum or add an electric vacuum pump.
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Old Apr 17, 2006 | 10:09 PM
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What's the magic number? That is at a pretty slow idle. The motor has a comp XE262 cam that I was told would produce enough vac to get the job done. The only other thing I can think of is a leak within the booster.
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Old Apr 17, 2006 | 11:48 PM
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block the booster port and recheck the vac, make sure what your vac actually is. If it comes up, you have a booster leak, replace it and your goos to go
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Old Apr 17, 2006 | 11:54 PM
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13 inches seems to be the break-point. Some systems will do good with 13, some not. Perhaps your Vette has a leak somewhere.
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Old Apr 18, 2006 | 12:50 AM
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I have 8-10 with a hot roller cam. No issues with operating the booster.
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Old Apr 18, 2006 | 07:56 AM
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Originally Posted by SIXFOOTER
block the booster port and recheck the vac, make sure what your vac actually is. If it comes up, you have a booster leak, replace it and your goos to go

Good idea, thanks
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