Question about 1994 Ford F250 Supercab
If your model has a Vacuum Reserve cannister, its probably rusted out on the bottom. This part use to look like a Coffee can and has a Vacuum line to it. (Plastic would have been a better material.)
If that is not the problem, you can hook up a manual Vacuum Gauge tester to the line that hooks up to the pump on the engine. The line should hold Vacuum. If it does not, start backtracking all of the hose connections. Eventually you will find a line that does not hold Vacuum. It could even go to a Power brake booster.
I had bought a used Diesel truck and the guy paid big money for a new engine-driven Vacuum pump. I kept dropping my Cruise Control up hills. I used a Vacuum tester and found my Vacuum Reserve cannister was rusted. The seller paid $300+ for a part not needed.
Posted on Jul 22, 2010
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Posted on Jan 02, 2017
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