NCDMV CDL Handbook

Commercial Driver’s License Manual – 2005 CDL Testing System

Never leave your vehicle unattended without applying the parking brakes or chocking the wheels. Your vehicle might roll away and cause injury and damage.

Subsection 5.4 Test Your Knowledge

1.

Why should you be in the proper gear before starting down a hill? What factors can cause brakes to fade or fail? The use of brakes on a long, steep downgrade is only a supplement to the braking effect of the engine. True or False? If you are away from your vehicle only a short time, you do not need to use the parking brake. True or False? How should you brake when you drive a tractor-trailer combination with ABS? You still have normal brake functions if your ABS is not working. True or False? How often should you drain air tanks?

2. 3.

4.

5. 6.

7.

These questions may be on your test. If you can’t answer them all, re-read subsection 5.4.

Section 5 – Air Brakes

Page 5-10

Version: July 2017