Technician Asays air fills the rear chamber when brake application opens the air valve and closes the vacuum valve, and the front chamber is kept in vacuum. Technician B says when the brakes are held at midpoint, both valves are closed to trap vacuum and atmospheric pressure and keep the diaphragm in a balanced position. Who is correct?

A. A only
B. B only
C. Both A and B
D. Neither A nor B


Answer: C

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