Line Lock Light

My car is a 4 speed therefore I lock out the rear brakes and hold the front with button engaged. When i let off the brake pedal with the line lock engaged the brake system warning light illuminates. Maybe using the dash light will work. Again with a manual trans i only use it for the burnout. I would thunk if you were footbraking an automatic you would not use the line lock but all four brakes to hold the car against the converter. Things get busy after the burnout in a nitrous srick shift car. I usually purge the bottle while doing a rockford style backup into my tracks. I like being the first to pre stage. : D