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Another quick check:
"A quick way to check the vacuum booster is to pump the brake pedal several times with the engine off to bleed off any vacuum that may still be in the unit. Then hold your foot on the pedal and start the engine. If the booster is working, the amount of effort required to hold the pedal should drop and the pedal itself may depress slightly. If nothing happens and the vacuum connections to the booster unit are okay, a new booster is needed (the vacuum hose should be replaced, too)."
Of course if you can create a vacuum source you can hook it up to the booster. If it does not hold vacuum, time for a new one.
And again, anything below 16-18 inches Hg and the booster will do little good. So if you are running a stock 5.0, you are good, if you are running a screamer, you are going to need a vacuum pump if you want to stick with power. Fortuniatly the dual diaphram design of the mustang II booster does help this situation a bit but there is only so much that can be done.
Rick
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