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Another cool trick we've seen is using a line lock (also known as a roll control or roll stop) such as this one. It can be plumbed right on the axle and is activated either electronically or by switching a valve. Simply step on the brake pedal to apply the brakes, flip a switch that activates a solenoid, or close the line-lock valve-depending on the design you're using-and it holds the pressure in the wheel cylinder to lock the wheel.

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