Posted by Bob on March 07, 2011 at 18:28:06 from (173.226.56.4):
In Reply to: vacume booster posted by Old Roy on March 07, 2011 at 18:14:56:
First off, the check valve isn't the problem. It's purpose is to hold vacuum in the booster for one or two brake applications with the engine stalled or shut off.
Secondly, even if the booster fails, the pedal shouldn't go to the floor... that is a sign of brake problems. It should simply lose the "boost" function, making for a "hard" pedal.
As to the whooshing sound, that does sound like a failed booster, but doesn't explain why the pedal goes all the way to the floor!
Perhaps there is BOTH a booster problem and a brake system problem.
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