Navigator 2WD V8-5.4L SOHC VIN L (1999)
Vacuum Brake Booster Check Valve: Description and Operation
The power brake booster check valve:
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is located on the front of the power brake booster.
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is positioned between the power brake booster and the power brake booster hose.
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closes when the engine is turned off.
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in the closed position, traps engine vacuum in the power brake booster.
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retains vacuum to provide several power-assisted brake applications with the engine off.