Air Brakes CDL Test (2024) - FREE MI CDL Practice Test

1. You should NOT use the parking brakes if:

2. If you are driving a 30-foot vehicle at 55 mph, you should leave at least _____ between you and the vehicle ahead.

3. Which of the following statements is true?

Poor cargo ventilation is a common cause of fire.
Carrying a properly charged and rated fire extinguisher will help prevent fires.
There is no way that short circuits due to damaged insulation can cause a vehicle fire.

4. Empty trucks have the best braking. True or False?

5. Front brake limiting valves were used to:

reduce your speed so further braking or shifting is not required.
reduce the chance of the front wheels skidding on slippery surfaces.
prevent overheating of the front tires.

6. The ________ brake system applies and releases the brakes when the driver uses the brake pedal during normal driving.

7. If you must drive through a deep puddle you should:

apply the brakes until your speed reaches 40 mph.
slow down and place transmission in a low gear.
speed up to get through the puddle as quickly as possible.

8. At 55 mph, the total stopping distance for vehicles with air brake systems traveling in ideal conditions is:

9. If the ABS is not working:

the vehicle will have no brakes.
the vehicle will have weak brakes.
you still have normal brake functions.

10. The s-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the s-cam because:

it applies a "Shock" to the brakes.
"S" stands for "Shoes".
it is shaped like the letter "S".

AIR BRAKES PRACTICE TEST - MICHIGAN