What is the acceptable amount of leak down when vacuum testing the stock brake booster? I mityvac'd down to 20"hg and it dropped to 5"hg in exactly 6 minutes.
The pedal seems to drop some normal amount when 18" vacuum is applied. Video: https://photos.app.goo.gl/xQP742XBxfWRNEGUA
Acceptable booster leak down '64
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Re: Acceptable booster leak down '64
I have never seen a spec for what you are asking.
And there may be one.
The spec you are asking about would be testing the check valve
Six minutes is a very long time if the engine was off and the booster stall had a vacuum signal
The only spec I have heard of if you are driving and the engine stalls out there should be enough boost for a couple braking applications.
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And there may be one.
The spec you are asking about would be testing the check valve
Six minutes is a very long time if the engine was off and the booster stall had a vacuum signal
The only spec I have heard of if you are driving and the engine stalls out there should be enough boost for a couple braking applications.
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2006 Lincoln Navigator Limited 5.4l 3V
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1970 Continental Mark III Triple Black 460 4v, C6, 2.80 (Used for Woodward Dream Cruise or just generally stored in Michigan)
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washmaster
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Re: Acceptable booster leak down '64
Alright. I should note that the leak down test as I performed it did not include the T check valve.
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