installed in the rear line works great as either a Line Lock for burn outs or a form of E Brake, pending how you plumb it and when you press and hold the button either before or after you press the brake pedal, as a Line Lock once applied you can then control forward motion of the car with the brakes for a rolling burnout or just sit still.
From memory when I installed mine plumbed per the instructions, if I pressed the button and then the pedal it would work as a rollcontrol E Brake. Ii just swapped the in/out lines and I now have a line lock for burnouts, press and hold the button, place foot on brake and hold, place shifter into 2nd, slam the gas pedal. Mine is auto but same thing works on a 4 sp, press teh button, drop the clutch, apply the brake pedal and smoke it up. I find it works better on the rear because when installed on the front as normal, your front brakes and line lock are either on or off, in the rear circuit, they can be on, off, midway, what ever way you like
