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Practice test 6 of 10

Idaho CDL — Air Brakes Practice Test 6

The Idaho 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.The manual gives a second name for the air storage tanks that the compressor fills. What is it?
  2. 2.The walk-around check of s-cam brakes has you pull hard on slack adjusters by hand. Which ones does the manual tell you to pull, and with what protection?
  3. 3.Going by the manual's typical figures, about how far does tank pressure drop between the point where the governor stops the compressor and the point where it lets the compressor pump again?
  4. 4.The manual adds brake lag distance to the stopping distance formula for air-braked vehicles. Between which two other distances does it sit in that formula?
  5. 5.The manual fits the extra air brake checks into the seven-step inspection. During which step do you check the slack adjusters on s-cam brakes?
  6. 6.Two trucks have wig wag low air warnings, one automatic and one the manual reset type. Both have just built pressure back above 55 psi. What is the difference in how the arms get out of the driver's view?
  7. 7.Trucks, truck tractors and buses must have emergency brakes and parking brakes that are held on mechanically. What does the manual say usually fills both of those needs?
  8. 8.To tell whether an older trailer has ABS, the manual has you look underneath for the ECU and for wheel speed sensor wires. What is the ECU?
  9. 9.When air enters the brake chamber of an s-cam brake, the push rod is driven outward. Which part does the push rod move next?
  10. 10.In the Idaho manual's 'What to Study' chart, Section 5 carries an asterisk. What does the footnote tell you?

0 of 25 answered