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Emergency brakes:
A.  Are not required on trucks.
B.  Are only required on trailers.
C.  Are required on tractors.
D.  Are optional.
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. These brakes must be held by mechanical force.
Answer Statistics
18 % of our users get this question wrong.
This questions is considered quite Hard

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