Has anyone installed a line lock set-up on their truck? I'd like any suggestions for solenoid controlled valves that are better than the dragrace set-up, which aren't supposed to be activated for long periods of time (60+ sec.). I want something to hold all my brakes, for many minutes, so not something where the solenoid is activated to hold, just to flip/flop a shut-off valve. I tow heavy boats and want to have a much more positive holding action than parking brakes can give me. Steep slopes are part of the job.
My understanding is that the race line locks will burn out the solenoid if held on for long periods, kind of like winch solenoids. I think that by hooking in a basic open/close valve to both front and rear lines, I should be able to lock all six wheels solidly, toggle switch on the dash in a safe place.
There must be a 12v open/close valve that can accomodate brake-line fittings.
Any help would be appreciated.

 

If you look in McMaster Carr catalog. They have a multitude of solenoid valves rated at continous duty but they are not cheap. I will suspect you'll end up investing about $100-$125 for a decent one that you won't lose sleep over when you actuate it. Keep in mind, as I'm sure you already know, brake systems are NOT low pressure systems so match the valve capability to the line pressures you'll encounter. Their current draw is minimal for such a device so that's where I'd start my search.
http://www.mcmaster.com/#standard-so...valves/=lpd7hc

 

Locking hydraulic brakes by trapping fluid under pressure without provision for makeup if a small leak develops if dangerous. Said small leak releases the brakes. If there were a backup electric pump that would pulse when needed to make up for a leak, it would at least be safe, especially if there were an alarm on the pump so you notice the activity.

just my 02

 

Here you go........They have lever-actuated and electrically-activated. http://www.mico.com/products

 

I have a small 4X4 and the park brake is mounted to the transfer case at the output of the rear drive shaft up high and out of water so in 4X4 it locks all the wheels and works incredibly well. Mine is a drum set up but I know there is a disc set up available. Something like this might be better for you and the ones I have looked at online don't require drive shaft modification. After searching for hours I cannot find a brake for the NV273, the nv241 and the NP205 are there. motor homes used to use these so perhaps there might be something there. I guess it would be possible to use a pinion mounted brake but it would be to open for damage. Wait I just noticed you have a 2002 that should have the NV241 and I did see some for that.

 

I fluked out today at one of the local parts stores. The old guy went right back to the shelves and pulled out an Afco part. It is used by towtrucks to lock the wheels when towing. All of us have seen them, I just haven't been in a bigger tow truck for awhile ( of course..., I'm in a Dodge, why would I ever need a tow).
The Afco and Mico seem to be very close, I'll get what I want from one of them. Thanks a lot for the help and responses. Safety first with the brakes.

 

I have the Mico mechanical line locks on my wheeling rig. One for the front and one for the rear. Flip the lever to lock and step on the brakes to engage. Flip the lever the other way to disengage. It has an indicator light to let you know if the line loses pressure. Haven't had any problems with bleed back yet.

 

The Mico lock has been around for decades and they work good. I remember seeing them on 50s corn shellers. Craig