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  #1  
Old 06-19-2014, 05:57 PM
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Rear disc brake conversion - what about proportioning valve?

So I am getting rear disc brakes with my upgraded axles. Who's swapped to rear brakes and did you have to do anything with the proportioning valve?
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Old 06-19-2014, 06:45 PM
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I installed rear discs years ago never touched valve.
Also added HB years afterwards again never touched valve.

Others have added rear discs and been fine.

My .02 your mileage may vary.
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  #3  
Old 06-19-2014, 09:05 PM
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J20 project J20 project is offline
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Quote:
I installed rear discs years ago never touched valve.
Also added HB years afterwards again never touched valve.

What he said,,,exept didn't do HB.

Stops,,,NOW...not sliding tires too.

No valve change.

J20
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  #4  
Old 06-19-2014, 09:59 PM
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ok cool. I am going to run it at Ouray without changing anything.
Dual diaphragm upgrade when I get back and if I don't like that I will do a hydro boost.

In Ouray a few guys will be HB'd I will see if they will let me drive their rig a little.
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  #5  
Old 06-19-2014, 10:17 PM
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srobertsfsj srobertsfsj is offline
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Quote:
Originally Posted by babywag
I installed rear discs years ago never touched valve.
Also added HB years afterwards again never touched valve.

Others have added rear discs and been fine.

My .02 your mileage may vary.


I have both rear disc and HB on mine. I did not touch the prop valve either.
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  #6  
Old 06-20-2014, 06:52 AM
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Scott you are making Ouray again this year right? I might ask to drive it a little bit and feel your brake setup.
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  #7  
Old 06-20-2014, 08:04 AM
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srobertsfsj srobertsfsj is offline
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I will be there but in a rental jeep
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  #8  
Old 06-20-2014, 04:33 PM
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Well who's going to strap Jeeps down Engineer then?

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  #9  
Old 06-20-2014, 05:20 PM
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That's what rentals are for..
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  #10  
Old 06-22-2014, 08:32 AM
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I changed the prop valve to a disc /disc version when I put my d60 axle in , they are available from summit , if your rig had disc in front stock it has a disc /drum valve , this holds more pressure in the rear lines to keep the drum springs from pushing back oil & causing more pedal travel , my thought was not to let the rear brakes be kept that tight , so pads are not worn out as fast & free rolling is achieved (mpg) , I haul heavy squat loads of firewood & a trailer this set stops very nice .they also sell a adjustable version
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  #11  
Old 06-22-2014, 02:40 PM
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I put rear discs on one of my Jeeps.
I only added SS braided lines, disks, and calipers.
Everything else is stock and so far it's been good.
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  #12  
Old 06-22-2014, 05:12 PM
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Texafornian Texafornian is offline
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I installed the kit offered by BJ's Offroad. I prefer to not piecemeal and stitch things together. Although, I'm sure many projects are successful using such a strategy. I prefer to to upgrade the whole enchilada at once, if possible. That being said, I went with a new disc/disc master cylinder, a new hydro boost, and the new fixed proportional valve supplied in the kit, by BJ's. So far, the results have been trouble free, excellent braking for the FrankenWagon. In my opinion, the braking experience could only be made any better with the addition of ABS or super high quality calipers, rotors, and pads. (Read super custom here)

PS. Although Wilwood does offer a nice two piston caliper for use the Wagonner. I expect to be upgrading to those calipers in the future. Just not now.
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  #13  
Old 06-23-2014, 09:22 PM
Pavementsux91XJ Pavementsux91XJ is offline
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Burts right. Most factory disc/drum prop valves have a 3-10psi residual pressure valve in them to keep some pressure on the wheel cylinders (supposedly keeps the seals pushed out so they don't leak, keeps the shoes from coming too far back etc etc etc) If it still works it needs to be taken out
as it can cause the rear calipers to drag. best advice is to take it on a good test drive after your done and really pay attention for any dragging noises or feeling from the rear end. after all, the seal in the valve is probably shot by now anyway and it doesn't take much to bleed off 10 psi from a hydraulic system.

Learned this the hard way with the swap on my XJ. I thought it was chatter from my fresh rearend at first, nope just brakes grabbing all funky.
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  #14  
Old 06-23-2014, 10:03 PM
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That's interesting. I didn't know that. One thing I will do is drive it a bit and then compare front/rear rotor temps. If the rear is hotter they might be rubbing during 'normal' driving.
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  #15  
Old 06-24-2014, 09:01 AM
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Tinkerjeep Tinkerjeep is offline
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Quote:
Originally Posted by will e
That's interesting. I didn't know that. One thing I will do is drive it a bit and then compare front/rear rotor temps. If the rear is hotter they might be rubbing during 'normal' driving.

Your fronts do most of the braking so they should be hotter anyway.

But then, they are dual vented disks so they shoud cool. Most rear disks I've seen are single. Will they cool better?

And after 1982 I think all front FSJ disk brakes became free-floating to remove drag issues so mileage would improve.

So...with all that in mind...what do you really think higher temps will indicate?
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  #16  
Old 06-24-2014, 09:25 PM
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If I drive it and the temps are a lot higher than the front it will indicate possible dragging. If they are not much hotter than, say, the axle it might indicate not dragging. Mostly just using it as a reference point. Do you have another idea?
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  #17  
Old 06-26-2014, 11:14 AM
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Tinkerjeep Tinkerjeep is offline
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Nope. No experience with aftermarket brake mods.

But without a baseline, you are really applying test results to an assumed theory...not really worth much unless you see a massive difference between the front and rear rotors, but then what do you attribute it to? smaller rear rotors, more drag, or mis-adjusted prop valve pushing more fluid to the rear?

I'd drive it, if you toast axle seals or bearings or you smell hot brake pads, something is wrong.
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  #18  
Old 07-06-2014, 11:02 PM
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I made no changes to Prop valve with my conversion..No problems so far.
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Old 07-06-2014, 11:27 PM
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what do you guys with rear discs do for E brake?
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  #20  
Old 07-07-2014, 07:51 AM
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Quote:
Originally Posted by Kenall
what do you guys with rear discs do for E brake?

Line locks, they plumb into the brake lines...

When I was chasing this down a few years ago, I remember reading about pulling the residual valve out of the rear port on the master cylinder. The article I read (cant find it, think its gone) talked about using a second used master for the front valve into the rear port. Here is a thread discussing it on the binder planet, with an article about it...

http://www.binderplanet.com/forums/s...d.php?t=110583
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