Coupling & UncouplingPregunta 9 de 60
Before supplying air to the trailer, why should you check the trailer brakes are set?
a.To keep the trailer from moving when the tractor backs under it or when air is applied
b.To warm up the brake shoes
c.To test the ABS light
d.To release the parking brake automatically
Explicación
You should ensure the trailer brakes are locked, either with wheel chocks or by having air already in the system, so the trailer cannot move while coupling. A trailer that rolls during coupling can cause serious injury or damage. Chock the wheels if you are not sure the spring brakes will hold.
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- After the tug test, why should you go under the trailer and look into the back of the fifth wheel?
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- When you push the trailer air supply valve in (supply air to trailer), what should happen?
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