How do brakes work on a long, steep downgrade?
a. They work as the main braking mechanism.
b. They work as a supplement to the braking effect of your engine.
c. They work as the main braking mechanism with the engine braking effect as an emergency backup.
d. Not applicable; no braking effect is involved in a downgrade.
Answer: b. They work as a supplement to the braking effect of your engine.
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