Vacuum power brakes are being discussed. Technician A says vacuum on both sides of the diaphragm doubles the amount of force on the master cylinder pistons. Technician B says the return spring forces the diaphragm to the forward position when there is vacuum on both sides of the diaphragm. Who is correct?
A. A only
B. B only
C. Both A and B
D. Neither A nor B
Answer: D
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