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booster check valve or vacuum reservoir
Posted by sloopjohnb (more from sloopjohnb) on Tue, 23 Oct 2007 04:27:23
In Reply to: Brake Booster - not holding vac while car off..., Jonathan Scupin
[Profile/Gallery]
, Sun, 21 Oct 2007 17:16:14
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Most likely the booster check valve...it's in the large diameter vacuum line at the brake booster.
You can check it by removing it after the engine has been shut off for a few minutes. If you hear the air rushing in around it when you pull it and the line out of the booster (it's in a rubber grommet) it's generally good although it could be leaking slightly if you lose vacuum overnight.
Or the grommet could be torn or leaking. Unlikely to have a leak in the hose itself cause this problem because you apparently have vacuum boost to the brakes...a hose leak would still keep vacuum inside the booster at the check valve.
posted by 140.185.5...
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