Practice question

Which statement is correct about trailer brake controls?

Use the hand valve as the parking brake
Ignore it if the tractor starts normally
Use the trailer hand valve as the main solution
The red trailer air supply control supplies or shuts off trailer air, while the trailer hand valve applies only trailer service brakes and should not be used for normal stopping or parking.

Answer: D — The red trailer air supply control supplies or shuts off trailer air, while the trailer hand valve applies only trailer service brakes and should not be used for normal stopping or parking.

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