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-   -   80 series simple Brake Mod (http://www.risingsun4x4club.org/forum2/showthread.php?t=7743)

Romer 07-24-2008 09:50 PM

80 series simple Brake Mod
 
I am probably behind the power curve here, but I just did the 5 minute modification to adjust the LSPV valve that adjusts the brake pressure between the front and rear brakes. When you lift the truck you throw it off kilter and basically are only using the front brakes. I lowered mine 1/4 of an inch and can now feel better braking performance. I had gone 50K miles and not even wore the rear pads.

It's so simple. Mark the LSPV and the frame. Place a mark about 1/4" below the mark, loosen the two bolts and lower it to the mark and tighten the bolts. That's it. You 4" lift guys may need to go a little bit more.

writeup and picture courtesy of this thread . This picture is with the rear drivers tire off. I marked the other side and did it with the tire on.

http://home.comcast.net/~ed.hughes/i...SPV_Before.jpg

Hulk 07-24-2008 11:15 PM

Your brakes perform better now? Hmmm. I need to look into this.

Romer 07-24-2008 11:16 PM

There is a thread on mud where you calculate how much you need exactly. I did the .25" to see if I could tell the difference and thats for a med lift which I am higher.

Romer 07-24-2008 11:23 PM

here is how you calculate


For a 4" lift

64/16

1/16 of 64/16=.25" for your 4" lift

I was a bit under .25" and mine calculates to .19" so I figure I am good

Uncle Ben 07-25-2008 01:29 AM

I assumed everyone marked their LSPV before they lifted their trucks then adjusted after the lift was installed. Mine was a PITA as while all the other bolts came off easy the LSPV bolts were rusted solid. Took me a bit of patience to get them loose and get the unit adjusted.

corsair23 07-25-2008 01:30 AM

You are behind the curve Romer :D

But, since Slee installed my lift at the same time they cut my rear cross member and installed the hitch dealyo in my bumper I guess I should verify they did this. I know I mentioned it but I never did look....

Hulk 07-25-2008 01:57 AM

Quote:

Originally Posted by Uncle Ben (Post 80964)
I assumed everyone marked their LSPV before they lifted their trucks then adjusted after the lift was installed.

Ah, well, you know what they say about assumptions. ;)

I'm more of a hack mechanic. The only way I find out about anything is through Romer, Corsair and Hants.

DaveInDenver 07-25-2008 06:48 AM

I did this less analytically. For mini trucks, there is a LSPV bracket that outfitters sell or give you with lift kits. Mine came from NWOR, but Roger Brown, Downey and maybe others have them. Or you can make one yourself with a piece of stock and a drill. It raises the mount on the axle to match the amount of lift. I had to adjust mine slightly more, even with the WilderNest my back brakes weren't doing much work until I really piled in the cargo. I messed with it one time camping by driving down a nice dirt road and slamming on the brakes, then adjusting the LSPV just above the point where the back brakes would lock in a panic stop. It's pretty easy to tell if you have the adjustment wrong. If you see the headlights of the people behind you coming down Georgetown hill after a day at Loveland, you have too much rear bias. :-)

http://www.4crawler.com/4x4/Images/rear_closeup.jpg

Romer 07-25-2008 08:07 AM

Quote:

Originally Posted by Uncle Ben (Post 80964)
I assumed everyone marked their LSPV before they lifted their trucks then adjusted after the lift was installed. Mine was a PITA as while all the other bolts came off easy the LSPV bolts were rusted solid. Took me a bit of patience to get them loose and get the unit adjusted.


When I originally lifted my truck 4 years ago I didn't even know what it was.

Bikeman 07-25-2008 09:05 AM

Quote:

Originally Posted by DaveInDenver (Post 80971)
I did this less analytically. For mini trucks, there is a LSPV bracket that outfitters sell or give you with lift kits. Mine came from NWOR, but Roger Brown, Downey and maybe others have them. Or you can make one yourself with a piece of stock and a drill. It raises the mount on the axle to match the amount of lift. I had to adjust mine slightly more, even with the WilderNest my back brakes weren't doing much work until I really piled in the cargo. I messed with it one time camping by driving down a nice dirt road and slamming on the brakes, then adjusting the LSPV just above the point where the back brakes would lock in a panic stop. It's pretty easy to tell if you have the adjustment wrong. If you see the headlights of the people behind you coming down Georgetown hill after a day at Loveland, you have too much rear bias. :-)

http://www.4crawler.com/4x4/Images/rear_closeup.jpg

If one raises the arm at the diff on an 80, it will interefere with the UCA.


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