California CDL Air Brakes Practice Test 3

How do brakes work on a long, steep downgrade?

They work as a supplement to the braking effect of your engine. Not applicable; no braking effect is involved in a downgrade. They work as the main braking mechanism. They work as the main braking mechanism with the engine braking effect as an emergency backup.

Correct Answer:

They work as a supplement to the braking effect of your engine.

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