Topic: LPSV removal

[Volcom]

I have a quick question.  What's the best way to hook the FROR proportioning valve to an 84 Toyota 4Runner?  Here's a picture of the valve


I want to remove the LPSV but there are three brake lines that attach to the LPSV and one brake line out.  I know that one of the three is the actual rear brake line, one is a bypass line and the last one is a return.  Am I correct?  I don't think I would need the bypass or the return line.  How do I block these lines off?

Where to you recommend mounted the proportioning valve?  Under the hood next to the master cylinder or under the truck near the LPSV?

I have seen these links
http://board.marlincrawler.com/index.php?topic=30308.0

http://home.4x4wire.com/erik/4runner/brakes/

[mudmaster]

Mine is under the hood.

[Volcom [OP]]

Mine is under the hood.

What did you do with the other two lines going to the LSPV?  Any pictures of your setup? 

[mudmaster]

No pics. Never removed it, just the rod.

[havik]

wow i just checked how much that thing cost.
$80+shipping+tax seems kinda high for what it's for.
i want one but cant swing the $80+

[mudmaster]

I got mine from Summit

[Volcom [OP]]

wow i just checked how much that thing cost.
$80+shipping+tax seems kinda high for what it's for.
i want one but cant swing the $80+

Expensive but I don't have time to dink around at Napa with fittings.  I've got 14 days until Moab and probably 40-50 hours of work still head of me

[Fearofrunner]

Volcom you should only have three total lines in the back,(two going into the LSPV and one comming out that goes to the rubber flex line) tie the bottom line (the one furthest from the body of the truck) of the two lines running along the frame on the rear into the hard line that is comming off of the flex line mount.





I noticed that your kit came with one female union, your going to need two so if it comes with a second then your golden. but use the female to female union to join you PV to the master cylinder and to the factory hardline under the hood of your truck (then this part is done)...
 


then take the second female to female union and tie the lines up in the back like in the second picture.

Your return line needs to be plugged some how you can either pinch the line with some vice grips or get a plug or do the sloppy set up i did in my build up

Good luck man i'll check this post frequently for updates

[Volcom [OP]]

Here are the instructions from FROR.  I emailed him and for some reason, I had no instructions with the kit.  No worries, he sent me some quickly.

1.   Install the two fittings supplied with the new Proportioning Valve, into each of the ports on the valve.
2.   Remove the rear brake line from the master cylinder, it is the line closest to the firewall.
3.   Install one of the supplied adapter lines into the master cylinder.
4.   Install the “IN” labeled port on the new Proportioning Valve onto the master cylinder.
5.   Install the other supplied adapter line into the “OUT” port on the valve.
6.   Connect the adapter line, and the stock hard line with the supplied metric union nut.
7.   You’ve completed installing the valve itself, now some stock lines just need slight re-routing.
8.   Go to the Passenger side frame rail, and look just behind the front tire, on top of the frame rail.  You’ll see 2 junctions mounted there.  One is a “T” fitting, the other is simply a 90.
9.   Unscrew the line running into the soft line for the right front caliper.
10.   Remove the line coming down the firewall, into the top of the “T” fitting, and install it into the right front soft line.
11.   Remove the short line that used to go to the front soft line from the “T”, and the other line running towards the rear from the “T” as well.  The “T” will not be used again, and can be removed as well.
12.   Go to the rear of the vehicle, and remove the short line running from the LSPV to the rear soft line.  Determine which rear line is still used (usually the upper one running into the LSPV).
13.   Finally install the rear line that is still used, into the rear soft line.
14.   Now you can remove the LSPV entirely, as well as the unused line running back to the front of the vehicle.


Thanks for taking the time to label your pictures Fearofrunner!  I will print them off and use them this weekend!

[DTB]

Here are the instructions from FROR.  I emailed him and for some reason, I had no instructions with the kit. 
Thanks for taking the time to label your pictures Fearofrunner!  I will print them off and use them this weekend!

take some pics for us of how u eventually set everything up! thanks! Collier

[Volcom [OP]]

Will Do! 

[TurtleTappers91]

I just copied AOR 4X4's adjustable bracket.
Cost me $1.35 for an eye bolt and a wing nut, and its fully adjustable,with no tools.

[jimbo74]

anyone use a stock toyota prop valve and just capped off.replumbed the otehr stuff?

[SACD_Runner]

i have a prop valve for the rear. Its mounted on my center mount shock brace, ill post some pics here soon. It works great at holding onto my E-brake cables too. too short haha

[DTB]

took a pic of my set up for u guys. it took like a half hour to hook up. great mod  plus it simplifies your braking system (eliminates the return line and LPSV). I subscribe to the K.I.S.S. theory in full! (Keep It Simple Stupid)
the "t" fitting removed and bracket ground off

 just one line running to rear now

[TurtleTappers91]

Toyota designed an important safety feature into the factory LSPV that allows more power to the rear brakes in the event of a front brake failure. 
Do these knob type valves incorporate this feature? I don't beleive they do.
It is VERY easy to cut off the rod and make a rig to hold the NUB, and to adjust it.
 

[DTB]

Toyota designed an important safety feature into the factory LSPV that allows more power to the rear brakes in the event of a front brake failure. 

reeeeeally? are you positive about that?  i thought its only function was load sensing

[jimbo74]

Toyota designed an important safety feature into the factory LSPV that allows more power to the rear brakes in the event of a front brake failure. 
Do these knob type valves incorporate this feature? I don't beleive they do.
It is VERY easy to cut off the rod and make a rig to hold the NUB, and to adjust it.
 

what did toyota do for the fact my 2wd never had an lpsv?

[TurtleTappers91]

reeeeeally? are you positive about that?  i thought its only function was load sensing

Gosh I don't have PROOF. Now I feel dumb.

[jimbo74]

i might try to just block out the system this week, if i can find plugs.....

[DTB]

Gosh I don't have PROOF. Now I feel dumb.

anyone know for sure??

[*ROKTOY*]

X2

anyone know for sure??

[Volcom [OP]]

I just copied AOR 4X4's adjustable bracket.
Cost me $1.35 for an eye bolt and a wing nut, and its fully adjustable,with no tools.

The problem with that is my LPSV is super old and rusty, it looks like it barely works.  I didn't want to mess with it and trying to bleed something that may or may not work correctly.

[insane04]

all it is for is under a load it takes extra pressure from the front and boosts the rear to compensate for the load.

there is not a return line like shown above all lines are pressure just used at different times (when needed)

and just plugging off will work just will have a low pedal. (that is how i did mine bu i am using chevy 4x4 calipers in the rear and they need more volume and pressure anyways)