Mountaineer 2WD V8-4.6L VIN 8 (2006)
Vacuum Brake Booster: Description and Operation
Brake Booster
The vacuum type power brake booster:
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is a dual diaphragm, vacuum assisted power brake booster.
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reduces brake pedal force 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 the brake master cylinder.
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is divided into separate chambers by the diaphragms.
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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 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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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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traps engine vacuum in the power brake booster when in the CLOSED position.
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retains vacuum to provide power-assisted brake applications with the engine off.
Active Brake Booster With Stability Assist
The active brake booster functions like a conventional brake booster with the added feature that it can be actuated electrically by the stability assist
module.
