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Don't go into rebuilding that vacuum pump until you're sure you need it. The best thing to do is go down to AutoZone and get a MityVac for about $26. It has a vacuum gauge on it that you can use to test the system. There's a port on the main vacuum line to the brake booster that supplies vacuum to the rest of the accessories (A/C, door locks, shutoff). If the vacuum is fine at that point, then your problem is an accessory leak. If not, then it is the vacuum pump, main line, or brake booster leaking.
Diagnose before you start changing parts.
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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References
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