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post #11 of (permalink) Old 30th April 2015
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Re: ABS pump fart

If it indeed goes sound like escaping gas could it be the brake servo being charged by the vacuum whereby its rubber diaphram flutters?

Does it only happen after the car has been parked long enough to lose all the vacuum stored in the servo? You could try emptying the servo before start-up to see if noise appears.

If the servo is on the same side of the car as the ABS unit the sound could be mistakenly thought to come from the ABS control unit.

I am only throwing ideas out there as I have no definitive answer.
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