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Question
The application pressure gauge:
Answers
A.  Shows how much air pressure is being applied to the brakes.
B.  Shows the temperature of air being used in the braking system.
C.  Shows the pressure of the air coming from the compressor.
D.  Shows the number of times the brakes have been used.
Explanation
In an air brake system, the application pressure gauge shows how much air pressure is being applied to the brakes. Not all vehicles with an air brake system have this gauge.
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