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Posted by hemimech [129.9.163.233] on Tuesday, March 09, 2010 at 11:17:12 :
In Reply to: ot - Durango brake booster question posted by AAA [216.177.165.76] on Tuesday, March 09, 2010 at 10:06:39 :
Yes it is a check valve. Typically there should only be vacuum flow when the booster/ brakes are in use unless the leak is upstream of the valve. You might be hearing the charcoal canister purge valve in operation. It hangs on a stand alone bracket near the booster with a vacuum line running to the intake and another that disappears down to the canister. If the booster or the diaphragm truly did have a leak you can usually hear it for several seconds after the engine is shut off.
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