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Truck Repair/vscum pump psi

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Expert: Van - 7/23/2007


Question
how mouch pressure should a vacum pump have on a 1983 ford 6.9 disel have. my brakes are hard to push and it shifts hard please help

Answer
Hi Michael,
Vacuum brake boosters usually operate on manifold vacuum for gas vehicles, which is usually aroung 15 Inches.
I am surprised yours uses vacuum. Sure it doesn't use hydraulic pressure from the power steering pump?

www.autozone.com may have the exact test specs.
Van

Truck Repair

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Van

Expertise

I can answer most questions concerning 4X4 engine, drive line, suspension, electrical, and fuel, both diesel and gasoline. Ford, GM, and Dodge, old and new.

Experience

I have been maintaining a fleet of approximately 55 light, medium and heavy vehicles for over 20 years. Most are 4X4 pickups and off road fire fighting trucks.

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