Thread: 1981 300SD No shutoff - how do I find vac leak?
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Old 01-02-2016, 06:18 PM
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mach4 mach4 is offline
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This would be a good time to check the vacuum pump as well. Disconnect the small vacuum lines from the main line between the pump and brake booster. Plug your mighty vac into one of the lines (making sure any unused lines are capped off). You should show 20 in-hg or so at idle. If it's way less disconnect the brake booster and recheck.
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