A line lock works like a one way check valve. Once the line lock is energized it allows brake fluid to flow in one direction only (some do not allow any flow).
So in a conventional set-up, you would turn on the line lock, pump up the brakes and the lock would keep the front brakes applied until the lock is release. But with this set-up, you don't want fluid to flow to the rear brake. If the lock is installed backwards it will not allow fluid to flow to the rear when the brakes are applied and the lock is on.

 

Right, I understand how they normally work...it's just the installing it backwards that's still throwing me off. Conventional Way---->holds pressure to the front brakes, no need for standing on the brake pedal with solenoid energized.....Backwards---->stops flow to rear brakes, but still have to hold pedal down.....Is that what I'm understanding and if so, why install it backwards? I'm guessing because the rear lines are the only lines(been a while since I looked under the truck at the ABS unit) after the ABS unit and therefore you're running it like this to keep from taking a chance on messing up the ABS system?

 

Right. After the abs module.
No one really knew what it would do to the ABS module if installed the convetional way.
The brake petal still needs to be pressed down (for the front brakes). Think of it as a high tech way to plug the brake line feeding the rear calipers.

As a bonus, you can ease off the brakes (front only) and have the truck roll forward while keeping it spining in third gear.

 

ok so now im interested in buying line locks, can you tell me where to buy them, which site, how much?

 

Summit has them or less than 40 bucks. You will need a line lock, and a really good double flareing tool. (My mac flaring tool had one hell of a time holding the brake line.) A swicth and some fittings.

 

Just click here

I think I still have the fittings you will need.

 

sweet deal thanks man, i have to line lock book marked, il probably get the one that comes with the switches and stuff but who knows when that'll happen, i have bigger performance fish to fry and that doesnt really include tires with a line lock either

 

After reading that last thread and thinking about some things.....has anyone tried installing it normally on the rear brakes and using it to launch off of since it would lock the rears until the power is turned off for the solenoid.

 

i dunno, seems like it woudl be just the same as stomping on the breaks as hard as you can and break stalling, i dont think it "locks" the breaks more than it holds the line pressure that you had on them when you pushed the swtich in so it would be the same as break stalling IMO but who knows. if you wanted to do something like that you would have better luck with a trans brake

 

okay, what a line lock does is actually lock the brake fluid OUT of going into the rear brakes. the line lock is an inline plug pretty much. it locks fluid from going into the rear brakes right after the distribution block under the cab of our trucks. this way, when you're applying the brake, no line pressure is building up in the rear so that you can easily do a burn out. but you are still applying the brakes to the front so that you're not rolling forward. so with the line lock activated, you have a brake bias of 100% to the front and 0% to the back.