E 450 V8-6.0L DSL Turbo VIN P (2004)
Vacuum Brake Booster: Description and Operation
Brake Booster
The power brake booster:
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is a dual diaphragm, vacuum assisted power brake booster.
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reduces brake pedal pressure and travel distance.
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is located on the LH side of the bulkhead in the engine compartment, between the brake pedal and brake master cylinder.
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is divided into separate chambers by the diaphragm.
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will not operate if vacuum is restricted or if any of the vacuum related power brake components fail.
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is installed new as an assembly.
If the power assist fails, the brake system will continue to operate with increased brake pedal effort.
Hose and Check Valve
The power brake booster check valve:
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is located on the front of the power brake booster.
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check valve and grommet can be installed new separately. 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.
