A driver crosses the air lines when hooking up to an old trailer. What will happen?

Question

Accepted Answer

C: If the trailer has no spring brakes, you could drive away but you would not have trailer brakes.. This situation would be extremely dangerous as crossing the lines would result in not having any trailer brakes since pre-1975 trailers tend to not have spring brakes.

A driver crosses the air lines when hooking up to an old trailer. What will happen?

Illinois CDL Combination Vehicles Test Info