Vacuum line comes off when car is shut off

Asked by Adrastus Apr 17, 2019 at 09:35 PM about the 2000 Pontiac Grand Prix

Question type: Maintenance & Repair

The vacuum line for the brake booster keeps coming off every time the car is
shut off. It's a tight fit and there is vacuum at the port when it's running, just
blows off when the car is turned off. Any ideas?

1 Answer


If there is a backfire, that will put brief pressure on the intake manifold where there is normally vacuum. That might be what's blowing the hose off. I would just clamp that hose on, even if there seems to be a tight fit. I had a vacuum line that runs the cruise control coming off because it was old and stretched. A clamp fixed it.

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