Line lock installation

[Scott Liggett]

I found a new Hurst Line Lock today at Long Beach Swap. I have a couple questions about installing one.

First, all the install diagrams show the brake line comes out of the solenoid and T's off to the two front brakes, but it has three outlets. Can you use more than one outlet? Many of the articles I see on the internet show that it does.

Second, Can you put it between the master cylinder and portioning valve? Or, should it always be after it?

[Ron Ward]

Re: Line lock installation

Did you get THESE instructions with it?

http://www.loco4fomoco.com/RollControl.pdf


Ron

[Scott Liggett]

Re: Line lock installation

I got one piece of paper with with it. It has most of that stuff, but it still doesn't answer my questions. If you look at all the diagrams, it shows a T after the solenoid to the front lines. Is it possible to connect both front lines directly to the solenoid?

[Ron Ward]

Re: Line lock installation

Based on the diagrams, I would say no. It appears the third port is only to be used for a pressure switch if needed. Otherwise, it is blocked off with a plug.


Ron

[VTJUNK]

Re: Line lock installation

Based on the diagrams, I would say no. It appears the third port is only to be used for a pressure switch if needed. Otherwise, it is blocked off with a plug.


Ron

Ron is right, the third outlet is for a pressure switch, but you can plumb your left and right lines directly to the solenoid. I have installed three of those and done two of them that way. They work fine.

[IRONHEAD]

Re: Line lock installation

master to line lock to valve.. make it easy.. that valve isn't in use when your use'n the line lock.. and when the line lock isn't in use.. it will not affect the way the po. valve works..
just make sure you leave the loops in the lines for frame to body flex

[ponchoman]

Re: Line lock installation

For whatever reason, Hurst recommends NOT taking both front lines independently off the line lock. They recommend going from a single port on the line lock to a T. I was thinking of using the line lock as the T also, but after discussing with Hurst I stuck with the traditional method. I'm guessing there must be a reason somewhere for them to say that. Don't know what it is and it certainly isn't obvious to me, but if the unit fails I want to be completely clear about what the issues might be.

[joebogey]

Re: Line lock installation

Is it possible that the solenoid releases one port then the other, think of a plunger moving through a bore. If it malfunctions and only releases one port, you'd have one locked wheel and one not. Don't think I'd want to try that.

[milner351]

Re: Line lock installation

Is it possible that the solenoid releases one port then the other, think of a plunger moving through a bore. If it malfunctions and only releases one port, you'd have one locked wheel and one not. Don't think I'd want to try that.

DING DING DING

I think Joe's nailed it - in some failure mode - you could end up with uneven brake pressure - which is what the mfgr wants to stay out of court for.

Wasn't there a thread many moons ago here about the logic of putting a line lock on the front lines vs the rear?

In one set up the solenoid applies the fronts, in the other, the solenoid prevents application of the rears.

[IRONHEAD]

Re: Line lock installation

For whatever reason, Hurst recommends NOT taking both front lines independently off the line lock. They recommend going from a single port on the line lock to a T. I was thinking of using the line lock as the T also, but after discussing with Hurst I stuck with the traditional method. I'm guessing there must be a reason somewhere for them to say that. Don't know what it is and it certainly isn't obvious to me, but if the unit fails I want to be completely clear about what the issues might be.

you'd crack a "t" on any body on frame car.. and even some unitbody 64-67 mustang..
as most will not put(lazy) the loops in the line for (give) and the tee will snap off the selnoid, and by by brake.

[ponchoman]

Re: Line lock installation

For whatever reason, Hurst recommends NOT taking both front lines independently off the line lock. They recommend going from a single port on the line lock to a T. I was thinking of using the line lock as the T also, but after discussing with Hurst I stuck with the traditional method. I'm guessing there must be a reason somewhere for them to say that. Don't know what it is and it certainly isn't obvious to me, but if the unit fails I want to be completely clear about what the issues might be.

you'd crack a "t" on any body on frame car.. and even some unitbody 64-67 mustang..
as most will not put(lazy) the loops in the line for (give) and the tee will snap off the selnoid, and by by brake.

What are you talking about? The question was whether you could run lines from each port on a hurst line lock to front brakes (there are multiple ports) or whether you need to go to some sort of T. Not how you would route the lines AFTER they came out of the line lock.

Also, you don't need loops. It depends on how you route the lines. You need sufficient flex in the lines to allow for movement.

[IRONHEAD]

Re: Line lock installation

ok whatever you say,,
all the car man. could've saved so much money if you engineered them.. as they ALL use the loops

[Scott Liggett]

Re: Line lock installation

I called Hurst this morning and talked to their tech guys. They said running two output lines to the front brakes is just fine. The solenoid acts in such a way that when it closes, there is a plunger that slides down inside stopping the flow of fluid. The three lower output holes are all on the same level. If fluid flow is restored to one, it's restored to all

[ponchoman]

Re: Line lock installation

ok whatever you say,,
all the car man. could've saved so much money if you engineered them.. as they ALL use the loops

Um... Nope. They don't all use loops. Sorry. No loops in my truck, the van, or my car. Factory. Fact is, now that I think of it I have not seen "loops" on a vehicle other than a classic in a good while. What is the mechanical advantage of a full "loop" over having sufficient flex?

[ponchoman]

Re: Line lock installation

I called Hurst this morning and talked to their tech guys. They said running two output lines to the front brakes is just fine. The solenoid acts in such a way that when it closes, there is a plunger that slides down inside stopping the flow of fluid. The three lower output holes are all on the same level. If fluid flow is restored to one, it's restored to all

Crap. I sure wish I'd have gotten the tech guy you did when I called them. It would have been a cleaner look. Too late now.