Expedition 2WD V8-281 4.6L VIN W EFI (1997)
Power Brake Booster Internal Components
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 two separate chambers by the diaphragm.
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Will not operate if vacuum is restricted, or if the vacuum related power brake components fail.
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Is replaced as an assembly.
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If the power assist fails, the brake system will continue to operate, with increased brake pedal effort.