Quote:
Originally Posted by Diseasel300
You likely have either a failing brake booster (the rubber diaphragm can develop tears or cracks) or you have a failed check valve in the brake booster vacuum line. Either one will allow the vacuum to bleed off when the engine stops.
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That makes sense, thanks. I believe the check valve is integral with the booster vacuum line. This is cheaper and easier to replace than the booster, so I'll do this one first. Now to try and find a part number...
Edit: found it, 210 430 37 29