Quote:
Originally Posted by bigcountrysg
The Vaccum Pump has nothing to do with the brake system on our trucks. The power booster for the power brakes receives hydraulic pressure from the powersteering pump.
Another thing it could be though is the ABS control.
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The OP did specify an E-
350, which DOES use a vacuum type booster fed by an engine driven vacuum pump, unlike F-Series trucks or E-450.