TCI Roll Control Line Lock
TCI Roll Control Line Lock. This dependable, quality unit provides first-class performance as a braking device. When installed in-line with the vehicle's front brakes, the roll control allows you to do a burnout like the professionals. Simply pump up the brake, apply the roll control and release the brake pedal. The roll control keeps the front brakes applied. If you did not pump up enough brake pressure - no problem - just hit the brake pedal and the unique one-way valve puts additional pressure through to the wheel cylinder side.