I got my line lock installed ... tried it out and the brake light on the dash lit up. I let off the lock .... still on. Pump the brakes it goes off. Sometimes it takes a different period of time for it to go out. Its not a big issue, but I'm curious on how/why it does that.

If worst case id take the bulb out. But not that important

 

The combination valve is doing what it's supposed to do. When you use the line lock you're holding pressure in the front brake lines. Since there's no pressure in the rear lines, the pressure switch is moved over and makes contact which turns the light on. When you pump the brakes the pressure is equilized on both sides of the switch and the switch is centered again.

You could also just pull the wire off the combination valve when you go to the track.

 

This is correct. Just dont forget to put the wire back on before you leave. If you leave the wire off, and there is a problem with your brakes on the road, you wont get a trouble light. Just my .02 worth. Thomas