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When the Hydro-Boost is in the release phase ________.


A) The vent port is opened
B) The fluid port to the power chamber is closed
C) Both A and B
D) Neither A nor B

E) B) and D)
F) A) and B)

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The proper operation of a vacuum brake booster requires that the engine be capable of supplying at least ________.


A) 21 in. Hg vacuum
B) 15 in. Hg vacuum
C) 17 in. Hg vacuum
D) 19 in. Hg vacuum

E) A) and B)
F) A) and C)

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Some vacuum boosters have more than one power diaphragm.

A) True
B) False

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Pushrod adjustment is checked with a ________.


A) Variable gauge
B) Feeler gauge
C) Either A or B
D) Neither A nor B

E) A) and B)
F) None of the above

Correct Answer

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A defective vacuum brake booster will cause a ________.


A) Slight hiss noise when the brake pedal is depressed
B) Low brake pedal
C) Hard brake pedal
D) Soft (spongy) brake pedal

E) A) and B)
F) C) and D)

Correct Answer

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