Possible to overadjust LSPV?

[alkaline747trio]

Since the honeymoon period of having the lift installed, I'm starting to scratch at some of the things that aren't working as well as they did before lift. First is the brakes, they never have been great, but I want them as good as they were before, and the only thing I can think of (not) holding me back now is the rear brakes.

I tried to raise the axle mounted part via the nuts on the longer bolt, but there were on there pretty tight, so I unmounted the two mounting bolts on the axle, found a lock washer, and raised it up so it is held in by the top bolt only.

I still don't think this is enough, after the adjustment nuts unfreeze via pb blaster, if I extend it as far as I can, will I have extend it too far for a 5" lift? How far can I extend it before I start doing more harm than good?

 

[Doc]

Have you adressed the frame mounted side of the LSPV? It can be easier to adjust as you don't have to move it nearly as far.

Yes, it is possiable to over adjust the LSPV, depending on lift.

 

[alkaline747trio]

No, I have not tried to adjust there, what is needed/how do you adjust it at the frame?

 

[mnwolftrack]

It is definately possible to over-adjust the LSPV. I did this on my '85 Toyota pickup and have to undo it. Before my tweak, the rear brakes weren't engaging hardly at all, partially do to a spring lift kit. I adjusted the nut at the end of the rod on the axle, and I adjusted the height of the LSPV housing on the frame (it doesn't take much at all!). I overdid it, and the rear tires lock up before the fronts. If you haven't experienced before what this does, it makes the back of the truck tend to want to pass up the front of the truck (e.g. go into a spin). Bad.

 

[Doc]

Alky- Follow the rod to the LSPV. The LSPV on the frame is held by a bracket and two studs. The holes these studs pass though is slotted on both sides. You can loosen the stud nuts and lower the LSPV as far as it will go, this should (on its own) be enough correction, put everything on the axle back the way it was. If you live in rust country, be prepared for a bit of a battle. My LSPV was so corroded and rusty that it had to be replaced completely. Not really that expensive, but a heck of a lot more expensive than just moving the valve.

 

[alkaline747trio]

I looked at the frame mount, and it looked like a phillips head, and only one screw. Correct me if I'm wrong, but is there an angled bracket that bolt to the from horizontally, then the LSPV is vertically attached to the bracket. Are the studs facing the front of the truck?