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Few reasons. For one, all it does it actuate the trailer brakes. This means the vehicle takes longer to decelerate or stop. And while it does keep the tractor brakes cool, it also heats up the trailer brakes at a higher rate, which in turn leads to uneven braking between the axles. In extreme instances, this could cause loss of control of the vehicle.

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βˆ™ 12y ago
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Tim Johnson-Watson

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βˆ™ 2y ago
So it won’t make the trailer skid

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