12. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:

Air Brakesmedium

ABalance the service brake system when you are parked.

BRelease the spring emergency/parking brakes to move a short distance.

CStay parked twice as long without using up service air pressure.

Detailed Explanation

The correct answer is "Release the spring emergency/parking brakes to move a short distance.". This is based on federal CDL regulations and safety standards.

Correct Answer: Release the spring emergency/parking brakes to move a short distance.

Ready to practice for real?

Take our free, full-length Air Brakes practice test. Simulates the actual DMV exam with timed questions.

Start Practice Test

12. If your truck or bus has dual parking control valves, you can use pressure from a separate tank to:

Detailed Explanation

Ready to practice for real?

Related Questions

78. To correct a drive-wheel braking skid, you should:

10. The safety valve is set to automatically reduce pressure at:

67. Why should you be in the proper gear before starting down a hill?

30. Under normal conditions in order to engage the parking brakes the driver must first:

101. It is not safe to drive a vehicle that has brake drums (or discs) with cracks or that are thinner than the manufacturer's specifications, generally this will be — an inch.