CDL · Air brakes
Using the service brakes too much makes them overheat. What can that excess heat do?
Correct answer: Cause the brakes to stop working.
Answer options
- ACause the brakes to stop working Correct
- BShorten the distance you need to stop
- CMake the brake linings grip the drums harder
Why
Constant hard braking builds heat that lowers the friction of the brake linings and makes the drums expand, a condition called brake fade that can leave the brakes unable to stop the vehicle. On long downgrades, use a low gear and engine braking so the service brakes do not overheat.
About this question
Topic: Air brakes License: CDL
Part of these practice sets:
Where it applies: Asked in every state.
Practice the whole set
This question is part of Mountain Grades and Brake Fade (16 questions). Take the full set and check your score.
Practice Mountain Grades and Brake FadeMore questions from Mountain Grades and Brake Fade
- On a steep downhill grade, what should do most of the work of slowing your vehicle?
- Partway down a long, steep grade, your brakes overheat and stop working. What is your best course of action?
- Your brakes give out while you are going down a long grade. What is the best thing to do?
- On a long, steep downgrade, which braking method should you use?
- On a long, steep downgrade, your speed has crept up to your "safe" speed. About how far below that speed should you brake before releasing the brakes?
- What is an escape ramp, like the one shown, meant for?
- Which of these can make your brakes fade?
- What is true about how brakes stop a vehicle?
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