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2026 Free Arkansas DMV Class A CDL Air Brakes Test 1
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Question Number 9
9. The rods in S-cam brakes move the slack adjusters when air pressure is added to the brake chambers. This air pressure is added to the chambers when the driver:
Presses the brake pedal.
Uses the emergency brake.
Uses the trailer hand valve.
✔ Correct Answer:
Presses the brake pedal.
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