Control to 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. This high quality solenoid can be used on either the front or rear brakes of your vehicle. It can handle pressure spikes up to 1000 psi. Works with 12-14 volt electric systems. Name:Line Lock kit Type:Brake LockCondition: New pressure spikes up to 1000 psi Works with 12-14 volt electric systems. Fitment: Works with 12-14 volt electric systems Colour:As Shown Material:Plastic + Metal Package Contents: 1 x Brake Lock 1 x Swtich Accessory 1 x Light Accessory 3 x Screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.