Because of a truck’s large size and weight, brake failure on commercial semi trucks can have disastrous consequences. While truck brakes in good condition should rarely fail, brake failure related accidents nevertheless cause injuries and fatalities every year. Why does this happen? Here are five reasons: Not using the front brakes. In an effort to save money on brake maintenance and tire wear, some owner operator drivers disconnect the brakes on the tractor. This leaves the trailer brakes with the full burden of braking the entire rig. Downshifting is also.

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