Control & OperationQuestion 74 of 120
You are parking on a slight grade and will leave the vehicle. What should you do?
a.Leave the engine running so the air system stays charged
b.Leave the transmission in a low gear with the brakes released
c.Shut the engine off, apply the parking brakes, and chock the wheels if the vehicle may roll
d.Rely on the service brakes alone
Explanation
Parking brakes plus chocks are what hold a heavy vehicle on a grade once the driver leaves. Service brakes bleed off as air pressure drops, and leaving the engine running or the brakes released allows the vehicle to move.
Practice all 120 questions free — no signup required.
Related questions on this topic
- Before backing under a trailer, how should the trailer height be set?
- You are uncoupling a trailer in a yard. Which sequence is correct?
- After uncoupling, you notice the landing gear crank handle is left extended. Why must it be secured?
- You are on a slick, snow-covered road descending a grade. What should you do with the engine brake or retarder?
- You are stopped on an upgrade in a manual-transmission truck and need to start moving without rolling back. What is the correct technique?
- How should you hold the steering wheel when driving a heavy vehicle?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Commercial Driver's License (CDL) General Knowledge Test · How we review