WJ brakes on MJ

[jeeppapa]

I had an XJ prop valve on mine and never felt quite right to me. I'm upgrading my brakes too and went with the 96 WJ booster I recently read the same post on prop valves and decided to put the MJ valve back on. Wish I'd never messed with taking it off. Created more problems then it was worth.

 

 

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[Rockfrog]

Inside the portioning valve there's a o-ring I believe to restrict/control the brake fluid pressure to the rear drums. When I did this swap converting to rear discs the common knowledge advice was to remove the o-ring. When I read up on the swap recently that was no longer the advice,. People say leave it alone and some claim the part numbers are the same even for the ZJ with rear disc. Plenty of folks a running rear disc with no changer to the proportioning valve so I'd say leave it be unless you have a problem.

 

Here is a link talking about it, remember is old advice now, I'd probably leave it alone, more likely to break it than have it go right.

 

 

 

http://www.lunghd.com/Tech_Articles/Suspension_Steering_Axles_and_Brakes/Proportioning_Valve_Mod.htm

 

 

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Problem here is there is no oring inside an MJ distribution valve. The proportioning is all handled at the rear LSV in the stock system. The stock "prop valve" is a simple pass through block on an MJ with the standard shuttle to activate the trouble light in the event of an imbalance.

The Oring mentioned would be found where the MJ has the secondary rear circuit feed. On an XJ, ZJ, YJ this would be where the metering valve would be found.

 

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[cruiser54]

 

Inside the portioning valve there's a o-ring I believe to restrict/control the brake fluid pressure to the rear drums. When I did this swap converting to rear discs the common knowledge advice was to remove the o-ring. When I read up on the swap recently that was no longer the advice,. People say leave it alone and some claim the part numbers are the same even for the ZJ with rear disc. Plenty of folks a running rear disc with no changer to the proportioning valve so I'd say leave it be unless you have a problem.

 

Here is a link talking about it, remember is old advice now, I'd probably leave it alone, more likely to break it than have it go right.

 

 

 

http://www.lunghd.com/Tech_Articles/Suspension_Steering_Axles_and_Brakes/Proportioning_Valve_Mod.htm

 

 

Sent from my iPhone using Tapatalk Pro

Problem here is there is no oring inside an MJ distribution valve. The proportioning is all handled at the rear LSV in the stock system. The stock "prop valve" is a simple pass through block on an MJ with the standard shuttle to activate the trouble light in the event of an imbalance.

The Oring mentioned would be found where the MJ has the secondary rear circuit feed. On an XJ, ZJ, YJ this would be where the metering valve would be found.

 

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Yup. The best way to do it is largely ignored on this forum. 

[HOrnbrod]

^^  Not yup because that's not the best way. It's another kludge. For great balanced braking on an MJ with a rear disk brake conversion and upgraded master/booster, retain the properly adjusted (key words here) LSV and the front distribution-only block. The LSV does all the portioning as originally designed and still functions as a LOAD sensing valve to regulate rear brake biasing. My Comanche stops way better under all conditions than you can imagine.

[cruiser54]

^^  Not yup because that's not the best way. It's another kludge. For great balanced braking on an MJ with a rear disk brake conversion, retain the properly adjusted (key words here) LSV and the front distribution-only block. The LSV does all the portioning as originally designed and still functions as a LOAD sensing valve to regulate rear brake biasing. My Comanche stops way better under all conditions than you can imagine.

Yup. Ignored. Only by those who haven't tried it. No empirical evidence. I don't need to imagine.

I've tried it both ways. The distro block restricts the living $#!& out of the front brakes. Been there and done that. All in a progressive manner to monitor changes.  If the front brakes can get the volume and pressure of fluid they need, the rear brakes don't lock with or without a load. 

 

Talk about kludgy. That's this whole $#!&ty LSV setup. 

[HOrnbrod]

Yup. Ignored too Renix kludge-guy.  :yes:

 

Have a good day. 

[cruiser54]

Just saying. For as much as you bash Renix, you sure seem to defend that braking system which is kludgy. I can just envision some Renault engineer  developing it. Probably consulted with  Bendix engineers. 

[zomeizter]

So I gather I need to leave the braking system fluid circuit untouched? That was my intention in the first place.