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Practice test 4 of 10

Delaware CDL — Air Brakes Practice Test 4

The Delaware 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.On your walk-around, you look over the air hoses that run to the brake chambers. What are you checking for?
  2. 2.Your truck has a dual air brake system. How will its supply pressure gauges be arranged?
  3. 3.In the emergency brake test on a tractor pulling an air-operated trailer, when should the trailer-side valves pop out compared with the tractor's own valve?
  4. 4.A pickup cuts across your lane with little warning, and your instinct is to hit the brakes. When does the manual call that a good response?
  5. 5.You want to know whether your truck was built late enough that ABS was required. Where does the manual tell you to find its date of manufacture?
  6. 6.How many brake chambers may a wedge brake have?
  7. 7.According to Delaware's manual, what is the air brake check on the inspection test designed to confirm?
  8. 8.When do automatic slack adjusters adjust themselves?
  9. 9.Which vehicles does the manual say must have both emergency brakes and parking brakes?
  10. 10.Where in an air brake system is the safety relief valve installed?

0 of 25 answered