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Pennsylvania CDL — Air Brakes Practice Test 1

The Pennsylvania 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.How are the powerful springs in spring brakes kept from applying while you drive?
  2. 2.Why can a heavily loaded vehicle take a long distance to stop once the spring brakes apply?
  3. 3.If a vehicle has an alcohol evaporator, is daily draining of the air tanks still needed?
  4. 4.Truck tractors with air brakes are required to have ABS if built on or after what date?
  5. 5.What is the main reason water must be removed from the air tanks?
  6. 6.When should you skip setting the parking brakes and use wheel chocks instead?
  7. 7.A visible low-air-pressure warning must come on before tank pressure drops below what level?
  8. 8.What is a 'wig wag'?
  9. 9.Why should you avoid pressing the brake pedal while the spring brakes are set?
  10. 10.If the safety valve lets air escape, what does that tell you?

0 of 25 answered