I purchased some brackets for 81-85 caliper and rotors for my rear axle. Just curious is anyone is running a similar setup without adding a proportioning valve .

 

for how litte an inline valve costs and how easy they are to install, why not just get one?

 

Cost is not a factor its curiosity. I read lots of threads saying its required. Where actual build threads never mention it. No kit includes one either.
So, who has experience running disk without a p valve?

 

i have all the crap to put the prop valve in my truck...it will go in when i do the discs.
i don't recall seeing a write up not using one..

 

My understanding is you don't need much braking force for rear discs, so if you leave it out you will be locking up the rear easily. Unless you're carrying a lot of weight back there all the time, I don't think you're going to like your experience with disc rears and no prop valve.

 

i have a trail gear rear disc brake kit on my truck for about four years now and i still have my proportioning valve to install. unless i clamp brakes on i do not lock up the rear end, i have an empty bed xtra cab. with the stock valve lspv.
you can put the valve in any time.

i just got home after using my truck for three days in the snow and ice from blizzard 14, oh what fun it is to own a yota!!

 

If you still have the stock LSPV, it is limiting braking force to the rear end. So you do have a proportioning valve (Load Sensing Proportioning Valve), you just have the stock one. You would lock up rear disks if you took out that LSPV... at least that's what I hear.

 

Good to read! Wasnt sure that served the same person. Thanks!

 

Back in the olden Days when I had been driving quite a few years Trucks had no such thing as the LSPV one just learned how to brake and drove according to the weather and load of the vehicle.

Besides except for the LSPV I needed to buy new I doubt any of the ones on my fleet work.

All I can say is try your rear discs see how they work simple matter to install a valve to limit fluid to the rear.

Because this liquid brine is destroying brake and fuel lines most of my LSPV`s have been disconnected to save the double run of brake line to the front .

To a valve not working.

 

^ correct ^ that is why i posted the setup i am using.

you do have to use a proportioning valve either stock lspv or (preferred) an adjustable aftermarket valve.
i have a wilwood valve i will be installing.

 

Which is helpful for the obligatory brake stand that our stock LSPVs don't let us do for some strange reason.