Before driving away, how can you always test the trailer brakes? | TruckersCombination Vehicle (CDL) Endorsement | Drivers License Practice Tests

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Before driving away, how can you always test the trailer brakes?

With the hand valve or by pulling the tractor protection valve, and accelerating.

With the hand valve or by pulling the tractor protection valve and then pulling against the brakes in a low gear.

With the hand valve or by pulling the tractor protection valve, and pulling against the brakes gently at a maximum speed