Anyone modified a Hilux Load Proportion Valve??

Post by **unbreakable** » Mon Oct 29, 2007 3:38 pm

The rear brakes on my Hilux aren't working real good if not at all. The handbrake works ok but not great. The truck sits 6 inches higher than standard and i've been told that the load proportion valve adjuster on the diif needs to be modified to suit the lift (the valve is located on the chassis and connects to the rear diff adjuster via a steel bar (spring - technical term) Has anyone modified thiers? Any help would be great.

Post by **brad 93hilux** » Mon Oct 29, 2007 5:01 pm

yes, where it attaches to your diff it is bolted with 2 small 10mm bolts, you simpily extend it up with a piece of flat bar so it matches your lift.

When i had leafs i had a 4" lift, and the flat bar was extending it up 4"...

Pretty simple, mine came with the complete lift i had from superior eng....

But not sure if this is going to help you too much as i thought that the brake bias was for when you are towing, the more the suspension sags, the more the valve adjusts and makes your drums work harder.

I could be wrong but...

Brad

Post by **4sum4** » Mon Oct 29, 2007 5:49 pm

cut it off near the valve and zip tie it all the way up your braks will be better

Post by **unbreakable** » Mon Oct 29, 2007 6:39 pm

4sum4, thats definately a quick fix, although when the truck is empty, would provide huge brake bias to the rear, which would be pretty hairy in the wet.

Post by **diesel028** » Mon Oct 29, 2007 7:55 pm

just cut a length of flat bar say 10mm x 3 or 4mm enough to match the lift uve added to ur truck. drill the two holes in each end of new extension and bolt to bracket on diff and LPV. i have pics of mine if ya want me to post or email them.

Craig

Post by **high n mighty** » Mon Oct 29, 2007 7:59 pm

Firstly mate, if your handbrake isn't working correctly it is a good indication of the adjustment on your drums generally speaking so this would effect your rear braking drastically.

Park ya lux and release the handbrake, then adjust the brake shoes with a flathead screw driver via small slot in the back of the drum brake assembly. Gently wind the adjustment up with ya mate spinning the wheel until you can juuuuust hear the brake shoe contacting the drum, the brake is now adjusted. Repeat on the other side.

The extension of the proportioning valve is as easy as mentioned above, simply use a piece of flat bar to make a spacer the same height as your suspension lift between the diff housing and the proportioning valve, I did the same on mine.

Also, alot of people forget to bleed the proportioning valve when they bleed the brakes, there is a nipple there

So maybe do a good bleed through to flush the system while you are there. Don't forget to bleed the furthest nipple from the master cylinder first and work your way towards it

I hope this helps mate, it improved my lux's brakes 600%

Post by **unbreakable** » Mon Oct 29, 2007 10:11 pm

thanks for the excellent advice lads, appreciate it heaps. Those pics would be a great help to. I had the truck up on jacks tonight and spinning the right rear makes an awful scratching noise inside the drum at one point of the rotation.

Post by **ozrunner** » Tue Oct 30, 2007 12:31 pm

4sum4 wrote:cut it off near the valve and zip tie it all the way up your braks will be better

Bingo, exactly what mine looks like

The LSPV is really a crock as most rarely work in used rigs for a variety of reasons so to set it so you always have max braking is a smart move.

The differences are minimal anyway but at least you always have the max available, which could make a huge difference in a situation

Post by **high n mighty** » Tue Oct 30, 2007 3:12 pm

unbreakable wrote:thanks for the excellent advice lads, appreciate it heaps. Those pics would be a great help to. I had the truck up on jacks tonight and spinning the right rear makes an awful scratching noise inside the drum at one point of the rotation.

Sounds like the drums need machining mate, otherwise the shoes are only going to contact drum on one patch which will make it very hard to adjust the handbrake(which as I said above is the basis of getting your brakes working correctly). I had to have mine machined because the right rear was locking up instantaniousll, I think it was about $30 per drum.

Post by **high n mighty** » Tue Oct 30, 2007 3:14 pm

Bloody double post

Post by **high n mighty** » Tue Oct 30, 2007 3:16 pm

ozrunner wrote:
which could make a huge difference in a situation

Yep, the difference between stopping or doing 360's because you have mutilated the LPV

Post by **vSAHARAx** » Tue Oct 30, 2007 3:29 pm

brad 93hilux wrote:yes, where it attaches to your diff it is bolted with 2 small 10mm bolts, you simpily extend it up with a piece of flat bar so it matches your lift.

When i had leafs i had a 4" lift, and the flat bar was extending it up 4"...

Pretty simple, mine came with the complete lift i had from superior eng....

But not sure if this is going to help you too much as i thought that the brake bias was for when you are towing, the more the suspension sags, the more the valve adjusts and makes your drums work harder.

I could be wrong but...

Brad

Exactly what i did with my 80 series last week! Superior engineering sells the flat pre drilled and everything for $20 if you cant be bothered making one yourself.

Troy

Post by **unbreakable** » Tue Oct 30, 2007 4:43 pm

thanks vsaharax, i think thats what i'll do, the time it would take to make it myself could be spent better driving around enjoying my truck.

Post by **ferrit** » Tue Oct 30, 2007 5:45 pm

its amazing what a tiny bit of air in your brakes can do too- check your proportioning valve for it.

i Know for a fact i have air in my front brakes (gotta bleed that out this weekend) but i bled my brakes in the rear when i rebuilt them several months ago, and didnt think there was air in them.

But when i bled the whole system, a hell of a lot of air came out of the passenger rear end!

Now the rear end (which is only drums!) locks up before the slotted rotor + HD pads front end!

Post by **diesel028** » Tue Oct 30, 2007 6:06 pm

unbreakable wrote:thanks vsaharax, i think thats what i'll do, the time it would take to make it myself could be spent better driving around enjoying my truck.

15 mins tops to make.....barely be able to get any driving in that time

Post by **chunks** » Tue Oct 30, 2007 6:43 pm

ozrunner wrote:
4sum4 wrote:cut it off near the valve and zip tie it all the way up your braks will be better
Bingo, exactly what mine looks like

The LSPV is really a crock as most rarely work in used rigs for a variety of reasons so to set it so you always have max braking is a smart move.

The differences are minimal anyway but at least you always have the max available, which could make a huge difference in a situation

Wake up... i have driven lowered hiluxes that haven't had the proportioning valve touched and as soon as there is some moisture on the road and you touch the brakes your locked up in the rear trying not to smack into someone.

Extend the mount and do it right.

Post by **vSAHARAx** » Tue Oct 30, 2007 8:53 pm

I drove without the bracket for 24 hours after doing the lift because the one they supplied was a little too long and the lspv arm thing was hard up against the upper control arm.

I re-drilled and trimmed the bracket installed it and oh yeah i noticed the difference!!! As chunks said above, if you do it........Do it right!!!

Troy

Post by **Rich** » Wed Oct 31, 2007 5:05 pm

Do the fixes and adjustments (adjusting the rear drum brakes with a flat blade screwdriver) the same for the new Model Hilux does anyone know.
I have the new model with the ARB OME suspension lift and my brakes are terrible....
Rich.

Post by **vSAHARAx** » Wed Oct 31, 2007 5:15 pm

Rich wrote:Do the fixes and adjustments (adjusting the rear drum brakes with a flat blade screwdriver) the same for the new Model Hilux does anyone know.
I have the new model with the ARB OME suspension lift and my brakes are terrible....
Rich.

All ARB do is attempt to bend the LSPV arm, friggin dodgy!!!

Post by **chunks** » Wed Oct 31, 2007 5:16 pm

Rich wrote:Do the fixes and adjustments (adjusting the rear drum brakes with a flat blade screwdriver) the same for the new Model Hilux does anyone know.
I have the new model with the ARB OME suspension lift and my brakes are terrible....
Rich.

Yeh mate the rear brakes in hiluxes haven't really changed over the years.

Post by **high n mighty** » Wed Oct 31, 2007 6:26 pm

vSAHARAx wrote:
Rich wrote:Do the fixes and adjustments (adjusting the rear drum brakes with a flat blade screwdriver) the same for the new Model Hilux does anyone know.
I have the new model with the ARB OME suspension lift and my brakes are terrible....
Rich.
All ARB do is attempt to bend the LSPV arm, friggin dodgy!!!

The same principle should apply

Post by **chunderlicious** » Wed Oct 31, 2007 6:58 pm

i dont run one, it did nothing. took it off and still does nothing. if it locks up the brakes just change the proportioning on the master.

Post by **unbreakable** » Thu Nov 01, 2007 12:24 pm

The extender plate turned up today for the LPV, so i'll fit it tonight and let you guys know how it goes. Even got a Superior Engineering sticker to add to the rest of the collection on the esky!

Post by **Rich** » Thu Nov 01, 2007 4:29 pm

Where is superior engineering where you get the extender plates from?
Rich.

Post by **vSAHARAx** » Thu Nov 01, 2007 5:27 pm

www.superiorengineering.com.au

Or you can contact Shane at

www.suspensionstuff.com.au

Post by **Gribble** » Fri Nov 02, 2007 12:23 am

high n mighty wrote:
vSAHARAx wrote:
Rich wrote:Do the fixes and adjustments (adjusting the rear drum brakes with a flat blade screwdriver) the same for the new Model Hilux does anyone know.
I have the new model with the ARB OME suspension lift and my brakes are terrible....
Rich.
All ARB do is attempt to bend the LSPV arm, friggin dodgy!!!

The same principle should apply

Yep, but the extended mount on the diff is way less bodgy.

When I played around with mine i noticed a massive difference when either the arm was low or tied up under the tray, i just played around until it felt right and the front wheels locked up and not the rear. Works fine and pulls up strong, even on 36's! Mind you there are a few other things ive done as well, but the brakes are as good if not better than standard in it.

Post by **spongerx** » Fri Nov 02, 2007 5:52 am

My model lux didn't come with one so I guess Toyota think they're useless too......
I hardly ever have weight in the back and it stops ok. The back will lock up but only if you really stand on the brakes and the back feels like it's comin off the ground at that point. Having to step on the brakes in a corner always produces interesting results but it's a high centre of gravity vehicle so to be expected.

Post by **Rory** » Fri Nov 02, 2007 7:41 am

i got rid of mine, have done it to many 2x4 luxs...iv found the ones i played with genrally didnt work at all! the front wheels still lock b4 the rears...alot easyer to bleed the system with it gone also lol they are a pain to bleed

Post by **Rich** » Fri Nov 02, 2007 4:06 pm

high n mighty wrote: Park ya lux and release the handbrake, then adjust the brake shoes with a flathead screw driver via small slot in the back of the drum brake assembly. Gently wind the adjustment up with ya mate spinning the wheel until you can juuuuust hear the brake shoe contacting the drum, the brake is now adjusted. Repeat on the other side.
:

Regarding the quote above:
In The new model Lux, I can't see any slot in the back of the Drum Brakes to adjust them...where is it?
I would like to make sure mine are adjusted as they don't seem to brake that well (31" tyres)
Do you have to take the wheel off to see it, or is it not there on my model - I have the new model SR5, so it has ABS.
Can anyone help or has anyone got a photo?
I have adjusted my LPV up as far as I can without the extension bracket, but it didn't seem to make any difference...
Rich

Post by **Rich** » Fri Nov 02, 2007 4:07 pm

high n mighty wrote: Park ya lux and release the handbrake, then adjust the brake shoes with a flathead screw driver via small slot in the back of the drum brake assembly. Gently wind the adjustment up with ya mate spinning the wheel until you can juuuuust hear the brake shoe contacting the drum, the brake is now adjusted. Repeat on the other side.
:

Regarding the quote above:
In The new model Lux, I can't see any slot in the back of the Drum Brakes to adjust them...where is it?
I would like to make sure mine are adjusted as they don't seem to brake that well (31" tyres)
Do you have to take the wheel off to see it, or is it not there on my model - I have the new model SR5, so it has ABS.
Can anyone help or has anyone got a photo?
I have adjusted my LPV up as far as I can without the extension bracket, but it didn't seem to make any difference...
Rich

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Anyone modified a Hilux Load Proportion Valve??

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