When soap-solution testing the operation of an FMVSS-121 treadle valve, what is the maximum permissable leakage at the exhaust valve during an 80 psi (5.5 bar) service application?

A. absolute zero
B. 1-inch (25 mm) bubble in 3-seconds
C. 1-inch (25 mm) bubble in 10-seconds
D. 1-inch (25mm) bubble in 60-seconds


Answer: B

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