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Florida CDL — Air Brakes Practice Test 1

The Florida CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.

This practice test follows that format: 25 questions, pass with 20 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 25

  1. 1.What information does the supply pressure gauge on the dash give you?
  2. 2.How does a Z restriction on a CDL differ from an L restriction?
  3. 3.You hold the brake pedal fully applied on a tractor-trailer with the engine off during the applied leakage test. The air loss rate that means the system fails the check is more than:
  4. 4.In the s-cam drum brake found on most heavy vehicles, pressing the brake pedal ultimately causes the s-shaped camshaft to:
  5. 5.The parking and emergency brakes on trucks, tractors, and buses must be held on by mechanical force, usually powerful springs, rather than by air. What is the reason?
  6. 6.Adding perception, reaction, brake lag, and braking distance together, a heavy vehicle traveling 55 mph on good pavement needs a total stopping distance of:
  7. 7.An air brake setup is really three braking systems in one. Which of them borrows components from the other two to bring the vehicle to a halt when the brakes fail?
  8. 8.Continuing to fan off air pressure with the key on, you watch for the parking brake knob to pop out on its own. In what pressure range should the spring brakes come on?
  9. 9.While driving a truck with a dual air brake system, pressure in one of the two systems falls dangerously low. What should you expect?
  10. 10.The governor on an air brake system will usually stop the compressor from pumping once tank pressure climbs to about:

0 of 25 answered