This electric solenoid valve is designed to be fitted into the front brake line to hold the applied pressure on the front brakes for the purposes of performing tyre warming burnouts prior to the start of a drag race to enhance traction off the line
The valve will hold whatever pressure is applied to the brake pedal so light pressure can be used for a "rolling burnout" etc
Not suitable for some ABS/traction control systems. On some ABS systems, 2 line locks are required