1.Application It can be used for racing or for street applications if you need a hill holder while stopped on an uphill grade. This high quality solenoid can be used on either the front or rear brakes of your vehicle. 2.Increase tire friction In the racing competition, keep the tires moving, let the tires warm up, and generate as much friction as possible with the ground, so that at the beginning of the race, the car starts at the maximum acceleration, as far as possible Achieve maximum speed in a short time. 3.High pressure brake This brake Line Lock can handle pressure spikes up to 1000 psi. The easily installed solenoid provides the brake holding capacity you are looking for. 4.Make the front and rear brakes synchronized Hold the brake pressure to the front or rear brakes to hold the vehicle on a hill or the starting line at the drags. Easy to do a burn out by locking the front tires and releasing the back brakes with this system. Works with 1216 volt electric systems.