Raised rear = adjust load valve

[Dluxv6]

Guys
found out a little trick today, firstly manual proportioning valve i was looking at is out of the question , totally illegal it seems.

The other is guess what, every one has been fooling around with the rod which gives little adjustment.
The LSPV at the other end of rod is .... you guessed it is adjustable.
If you look at the valve there is two 12mm nuts that hold it to the chassis rail, undo slightly and you will be able to move LSPV up or down, be careful here as moving it either way greatly influences the valve because you will see it is connected directly to pin in the LSPV.
Ok this is what happens, rod gives adjustment slightly because of lever effect.
Adjusting the LSPV Body say only 5 mm gives massive adjustment because adjustment is happening at the valve.
1 Undo bolts and pull LSPV Down towards floor will give full pressure to rear brakes.I tried it on the road , it was fun .rear locks up with little brake pedal effort.
2 Undo bolts and push LSPV up a little and retry brake test.
3 When you have it in a position your happy with ie fairly good rear rear brakes with little effort at the pedal, deadjust the rod end which gives little adjustment over wide motion if you know what i mean , this will make brakes less aggressive to a happy medium for you.

I have adjusted mine and 100% happy , it worked for me.


Drew

[Quinny34]

awesome find Drew... that may explain the reason we have had varied results from the forum.... some peoples are probably slightly diferent from factory....

[9W6VX]

Hmmmm.... food for thought............. I know many members here have been unhappy with the rear brakes.

Let's hope this method works.............

[mblux]

mmmmm will look into that ??? interesting

a major company have just r&d upgrade kits with all testing for dotars and there method of brake testing still involves lenghtening the rod and checking brake bias kpa readings front to rear no guess work or what feels to work, actual readings , i will try to scan spec sheet for lpv mod realeased by them and post it ? i do agree there is always more then one way to acheive sometimes what you want or need !

cheers mark

remember be carefull and safe playing with brakes ?

[david allan]

mblux
What you say you need to raise the nut by the same amount you raise the vehicle.
Eg if you raise the vehicle by 45mm then you should wind the nut up by 45mm.
Do you think this is right

[mblux]

hi dave
i am only going on what we do to gvm upgrade s and also suspension lifts as a rule of thumb which from a lot of testing will get you as a bush mechanic as close as possible . to be 100% correct pessure is the true way , and all major companies do the rod extension thing , the above is interesting though havent had time to look at that yet but i will , i had a drive of a trd on thursday and it had awsome brakes sh#t all over a std one but i guess thats part of the extra moneybig disc and calipers . mine now that it has all correct pressure is good and i am happy with brakes . i am allways open to other ways though . raising by the lift is as close as you will get without testing pressures ? i beleive in my experience ! my opinion only guys !!!

cheers mark

[Skog07]

This is my experience with the Hilux brakes.
Had the 50mm lift in the rear end for over 45000ks now. I have had absolutely no complaints with brake bias. I have not touched the LSPV at all and it wasn't moved by the aftermarket suspension supplier at all at time of instal.
The report for the 50000k service for the brake pad life came up as.
70% Front.
50% Rear.
45000ks of the brake pads life had been with 31's as well.
Since the spring upgrade in the front end I have also noticed that the front doesnt dive as much like it used to under braking (especially heavy braking) and the rear doesnt lock as easily due to the weight transfer to the front not being so dramatic either.
Cheers
Skog

[tasibrett]

For those who have fitted air bags to the back, as you know by blowing up the bags when loaded the only way to get proper rear braking is to get under and lengthen the rod and the when you unload and let the air out you have to shorten the rod again or else the rear end locks up in the wet.I have been working on a idea of using a small air ram fitted in where the adjustable rod is so I can extend it when I blow the bags up and retract it when I let the bags down. I found a ram with 80mm travel and a 10mm bore for $60 new, has anyone done something similar ?
Thanks
tasibrett

[tasibrett]

Got the $60 ram but it was too fragile so I ended up making one
Now when I blow up the air bags I just turn the ram on

[eggylux]

Hi,
Done some research in regards to lift kits. Found the fella, Terry, at 4wd Direct sells an extender piece for the rear brake valve. Might be worth a call.
Eggy.

[roys]

I have also had braking problems, but why are you guys adding bits to the valve rod? The load proportioning valve has quite a bit of adustment itself. I have had mine adjusted twice, first after fitting lifted suspenion, and just yesterday after fitting airbags which has increased the hieght. There is still more adjustment left.

[Viper82]

As I lifted my car this weekend I found this very helpfull in adjusting mine so here is some pics of what bolts to adjust and how far I moved mine. I still reckon I need to wind the bolt a little more on the diff for a bit more pressure.



Only undid them a little and tapped it down from the top after marking where it was in standard position incase I needed to move it back.



adjusted down about 5mm

[paw55h]

Hate to drag up old threads but does anyone have photos of the above as these links don't seem to work anymore

I have had my lux lifted and rear brakes are now non existing or it seems

[stevehastings]

Hate to drag up old threads but does anyone have photos of the above as these links don't seem to work anymore

I have had my lux lifted and rear brakes are now non existing or it seems

X2

[stevehastings]

Thanks to viper82 for your help it worked good, and did not need to wind the nuts up very much

[LJV13B]

Digging up an old thread here but does anyone know a factory setting for the valve adjustment?

[BCH]

I have just had the lux for a service & brake force test with the local dealer & I am told that the LSPV it at maximum setting and has fluid bypassing a seal internally and therefore is technically "failed". Front brakes reading 1500 - is perfect, back brakes reading 66 - should be minimum 90 ???.

Has anyone had a LSPV fail before, because I believe they are about $360 + fitting? I remain a bit sceptical, since the Tojo mechanic I spoke to had never heard of extending the threaded rod to get more adjustment.

The dealer has previously installed (2009) a new bracket to accommodate more LSVP adjustment when I added 2" lift to the rear.

[shanno]

I think the factory setting ie no lift should be around 190mm in length(A). Someone correct me if Im wrong.

[9W6VX]

190mm is the initial length.

Standard adjustment is 184 to 196mm.

Mine is adjusted to 196mm as my rear end is more or less at standard height as my leaf springs have sagged after 5 years.

[BCH]

So if airbags are in play & the tail lifted further to accommodate extra weight, then "A" in the diagram needs to increase again? I am still puzzled about the apparent "bypass failure" of my LSPV.