Which trailer suspension defect should keep the trailer out of service?

• A.Dust on the air bags of an air suspension
• B.A shock absorber with a light film of road grime
• C.Even wear on both trailer tires
• D.A cracked or broken leaf spring, or a spring hanger that is loose or damaged

Why

Springs and hangers position the axle and carry the load, and a failure can shift the axle at speed. That class of defect is not a note-and-drive item on a trailer any more than on a tractor.

Manual topic: Combination Vehicles - Trailer Inspection · From the Combination Vehicles practice bank (CV-165).

Practice this subject as a full test

More Combination Vehicle Inspection questions

• After coupling, where should the fifth wheel locking jaws be closed?
• You see a visible space between the trailer apron (upper coupler plate) and the fifth wheel skid plate after coupling. What does this most likely mean?
• When inspecting the landing gear during a pre-trip inspection of a combination vehicle, what should you check?
• When inspecting the fifth wheel itself, which condition is a defect that must be fixed before driving?
• Why should the fifth wheel skid plate be kept properly greased?