What is this thing attached to the pan hard bar?

infamousRNR

Senior Member
Never seen this before. It's attached to the pan hard bar and has some sort of spring on it...

Neither of my 4runners had it. Who can explain this?...


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It's a load sensing brake proportion valve

It adjust the pressure to the rear brakes depending on the load you are carrying in the back of the 4Runner.


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That looks like a LSPV--Load Sensing Proportioning Valve. If this rig does NOT have ABS, that's what it is. Presumably your other rigs had ABS, and thus no LSPV.

Most 3G's have ABS. This is probably an early year and a base model (wild-ass guess).
 
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Many 4 cylinders have LSPV.

Yep, it's a 4 banger 2 wheel drive. [MENTION=102606]infamousRNR[/MENTION] and I installed a lift for this dude [MENTION=92488]Jbot[/MENTION] (aka James) who's studying electrical engineering at UC Davis. The lift didn't go as quickly as we would have liked, but we gotter done, and celebrated with some tasty beers and sandwiches afterward in Downtown Campbell.
 
I haven't adjusted anything and my brakes seem to be fine. Should this be adjusted? And how?

if your truck is a base 2wd 4cyl non abs truck then when you lift it, the lspv must be adjusted so that the truck doesn't think its under hard braking. there are many threads and articles on how to adjust it.

....but if your truck is anything other than stated, chances are it doesn't have an lspv because it has abs, and in that case you don't have to worry when you lift.
 
I haven't adjusted anything and my brakes seem to be fine. Should this be adjusted? And how?

Hey James, I think you're gonna be just fine. The Load Sensing Proportioning Valve's purpose is to give you increased brake power to the rear brakes when you have the back of your truck loaded down with a bunch of weight. As the suspension compresses from added weight, the panhard bar which the spring is attached to sinks down, pulls on the spring and opens the valve sending more brake fluid pressure to the rear brakes. I remember when I was working on your truck that I saw brake lines running to and from the LSPV.

Some stated your brakes could lock up but there's no way that's going to happen by adding a lift if you understand what the valve is accomplishing for you. What you would have to worry about is when you are carrying extra weight in the back, it's going to take more compression of the panhard bar to open the LSPV valve because the panhard bar is now riding at a greater angle than before. So, looking at the picture Sean provided, you can adjust the spring a little tighter to take out the slack we created with the lift by adjusting the bolt on the bracket attached to the panhard bar. I would guess you would want to adjust the spring to take out the slack but not enough to actually open the valve. This way you could get the appropriate amount of additional braking power to the rear brakes when carrying extra weight in the back.

I hope my explanation make sense.
 
...and, really, what's the point of lifting a 2wd 4-banger? Why not put a winch on it, too?

Come on Durk, I think there's tons of people on this forum with plenty of unnecessary shit on their rigs, but who are we to judge. If it makes them happy, that's all that counts.

Edit: Also, what I forgot to mention is the main reason for the suspension work is his components were really tired and why not give yourself a little lift if you going to be in there replacing springs and shocks. He put 99 coils up front, Old Man EMU 906s in the rear and Bilstein 5100's all around. So, a very mild lift and I have to say it does make the truck look better and he reported the ride is significantly improved. So, I'd say it was time and money well spent.
 
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Come on Durk, I think there's tons of people on this forum with plenty of unnecessary shit on their rigs, but who are we to judge. If it makes them happy, that's all that counts.

Edit: Also, what I forgot to mention is the main reason for the suspension work is his components were really tired and why not give yourself a little lift if you going to be in there replacing springs and shocks. He put 99 coils up front, Old Man EMU 906s in the rear and Bilstein 5100's all around. So, a very mild lift and I have to say it does make the truck look better and he reported the ride is significantly improved. So, I'd say it was time and money well spent.

Uhh, ok....curious....what tires and wheels? That thing probably came with 15-inchers.
 
Lifting had no adverse effects here, I have that exact setup and at one point around 5" of lift on the rear axle.
 
mtbtim;2396he883 said:
Edit: Also, what I forgot to mention is the main reason for the suspension work is his components were really tired and why not give yourself a little lift if you going to be in there replacing springs and shocks. He put 99 coils up front, Old Man EMU 906s in the rear and Bilstein 5100's all around. So, a very mild lift and I have to say it does make the truck look better and he reported the ride is significantly improved. So, I'd say it was time and money well spent.

Yup ^ pretty much sums it up. I understand your explanation above as well and i will take a look at it in the morning, but from what i've read and wit the confirmation from [MENTION=90352]UnderFire[/MENTION] I'm sure it'll be fine.

Also shout out to [MENTION=102606]infamousRNR[/MENTION] and [MENTION=120071]mtbtim[/MENTION] for all the help and patience in dealing me and helping out with the suspension replacement.
 
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