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3

My first thought is that the trailer brakes are correctly adjusted and the trucks are out of adjustment. Excessive pedal pressure (movement) is required to engage the truck brakes. This over brakes the empty trailer causing the lock-up.


6

The issue most likely is, the trailer was empty. The brakes are designed to work well when the trailer is full. As you can imagine, if the dump was full of loose gravel there'd be quite a load in it. When the trailer is empty, the same amount of force on the brake pedal can cause the brakes to lock up easily. This is something more for the driver to worry ...



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