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need help interpreting brake booster test with vacuum pump 200

posted by  Dasein on  Sun Jun 24 14:07 CST 2007
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last visit: Fri Feb 18 00:34 CST 2011
[RELATED]

I was trying to check possible sources of vacuum leaks and thought to check the brake booster by hooking up a vacuum pump to the large hose that goes to the check valve. It would hold 12-13 inches of vacuum steady, but it would not allow me to pull anything above that with my pump (the pump easily pulls 25 inches of vacuum on a closed hose).

Is this what I should be seeing? Does the booster bleed off vacuum above 13 inches while maintaining a vacuum reserve at that level via the check valve? This is an 84 240.

Any help interpreting this result is much appreciated.
-John,
84 and 86 245s






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