Wow! This post is still going ?!!?
1) line locks work by stepping on the brakes and holding the button. Then you let off your foot to the brake pedal to apply throttle. You then let go of the button to release the front brakes to let the car lay down a strip of rubber you back over and it gives you traction on your launch. There is more there than just smoking the crap out of the tires.
2) if you attach a line lock to the rear or left rear or right front or how ever you want to hook it up - have at it. Do it how ever you want. But by locking off the rear brakes you still have to step on the brake to apply the fronts. If you run a stick shift like I do... then you have to take foot off brake, let go of the electric switch and then apply throttle. Thus loosing approx 1-2 seconds of your time. Dependent of course how fast you can move.
3) locking rear brakes off means of electrically something goes south you have only front brakes to stop you. Even though rears are about 30% of your braking, they keep the car from swerving side to side when high speed braking- like at the big end of the track. If the set up is on the front like it was designed and the solenoid locks on for hydraulic issues or electrical issues - and they do. They you don’t move and the car gets towed off track. 0mph.
Yes OP asked can you hook up to front or rear. “Yes!” But my answer is “why would you?” Maybe the OP did not know the real answer. May be I’ve been doing it wrong for 30 years. My mistake.
