2024 MD CDL Practice Test: Class B - Test 2
Based on
2024 MD CDL Handbook
8. How do air-operated disc brakes work?
A
They use compressed air instead of hydraulic fluid.
B
All of the listed answers.
C
They use an air compressor to feed air through a brake pipe into air tanks on each car.
D
When the engineer applied these brakes, the pipe filled with air and squeezed the brakes.