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Practice test 5 of 10

Minnesota CDL — Air Brakes Practice Test 5

The Minnesota 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.Air brakes on a large commercial vehicle are actually made up of which three separate braking systems?
  2. 2.How does an air brake system turn on the brake lights to warn drivers behind you?
  3. 3.Why shouldn't you set the parking brakes when the brakes are very wet in freezing temperatures?
  4. 4.On a tractor or straight truck, the spring brakes will come fully on when air pressure falls into which range?
  5. 5.Which sequence describes stab braking?
  6. 6.What does an alcohol evaporator do for an air brake system?
  7. 7.Where is the ABS malfunction lamp located on a truck tractor or bus?
  8. 8.Traveling at 55 mph on dry pavement, roughly how many extra feet does air brake lag add before the vehicle starts slowing?
  9. 9.What is true about using the front wheel brakes on a commercial vehicle?
  10. 10.With the engine off and the parking brake released, the air pressure loss on a single vehicle should be no more than how much per minute?

0 of 25 answered