F 150 2WD Pickup V8-4.6L CNG SOHC VIN 9 (1997)
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Is a single or tandem 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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Will not operate if vacuum is restricted or if any of 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.