Practice question

When uncoupling on any noticeable grade, the safest added protection is to:

Chock the trailer wheels as well as setting brakes
Trust air pressure forever
Leave the tractor attached with no brakes set
Pull the service glad hand only

Answer: A — Chock the trailer wheels as well as setting brakes

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: OR CDL Combination Practice Questions - Oregon CDL Combination Vehicles Test Exam →