System Parts第 13 / 60 题
What does the brake pedal (foot valve) do in an air brake system?
a.It pumps air into the storage tanks
b.It drains water from the reservoirs
c.It controls how much air is sent to apply the brakes
d.It engages the parking brake springs
解析
Pressing down on the brake pedal, also called the foot valve or treadle valve, sends air to apply the service brakes. Pressing harder applies more air pressure and more braking. Letting up on the pedal reduces the air pressure and releases the brakes.
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