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Practice test 6 of 10

Delaware CDL — Air Brakes Practice Test 6

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.You are about to troubleshoot a brake adjustment problem on a vehicle with automatic slack adjusters. What does the manual say to consult first?
  2. 2.You brake hard on a slick road in a rig without ABS, and wheels other than your steering wheels lock up. What does the manual say can happen?
  3. 3.Your truck has a dual air brake system. How will its supply pressure gauges be arranged?
  4. 4.Why does the manual warn against walking away from your vehicle without setting the parking brakes or putting chocks under the wheels?
  5. 5.Only your tractor has ABS. Which part of the rig does the manual tell you to keep an eye on while braking?
  6. 6.On a truck with a dual air system, the low air warning has to come on before pressure falls under 55 psi. Which tank's pressure is the one that counts?
  7. 7.For the L restriction on a CDL, what does the manual count as 'air brakes'?
  8. 8.What does the manual say is the likely result of routinely adjusting most automatic slack adjusters by hand?
  9. 9.On a vehicle with air brakes, what takes the place of the hydraulic brake check in Step 7 of the seven-step inspection?
  10. 10.Your low air warning is on, and you are driving a lightly loaded truck on a slippery road. What does the manual warn can happen if you keep going until the spring brakes apply on their own?

0 of 25 answered