Brake proportional valve ? Again - JeepForum.com
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post #1 of 17 Old 08-21-2017, 07:58 PM Thread Starter
ton12loc
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Brake proportional valve ? Again

I posted a question about this valve yesterday and got some answers to replace it. It was new and I must have just got a defective one. I was wondering if the xj and yj valve are the same? There are some xj's in local junk yards and usually no yj's. I was supposed to leave for Ocean city Jeep week in MD Wednesday and I wouldn't be able to get a new one by then.

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post #2 of 17 Old 08-22-2017, 07:16 AM
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As long as the XJs have the same set up disc/ drum. You should be good to go.
I would grab the fittings from the brake lines going into the proportioning valve to make sure they are the same too.
You may have to get some adapters or re flair some lines.

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list.
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post #3 of 17 Old 08-22-2017, 08:11 AM
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Can you use the old one? Or maybe swap the switch?

Bill
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post #4 of 17 Old 08-22-2017, 07:21 PM
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I don't want to hijack this thread, but what is the purpose of the proportional valve? Mine is NOT connected. Brakes work great.


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post #5 of 17 Old 08-23-2017, 01:08 AM
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Quote:
Originally Posted by mikwallace View Post
I don't want to hijack this thread, but what is the purpose of the proportional valve? Mine is NOT connected. Brakes work great.

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Main purpose is to restrict (proportion )fluid flow to the rear drums when you hit the brakes hard in a panic stop so the rear drums don't lock up. Secondary function is to alert you if yhe front or rear system loses fluid.
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post #6 of 17 Old 08-23-2017, 08:31 AM
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Quote:
Originally Posted by mikwallace View Post
I don't want to hijack this thread, but what is the purpose of the proportional valve? Mine is NOT connected. Brakes work great.


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So you're saying that this is in your Jeep, but not hooked up?



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post #7 of 17 Old 08-23-2017, 10:09 AM
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Originally Posted by Mr.B View Post
So you're saying that this is in your Jeep, but not hooked up?
Well, he/she doesn't mention what type of Jeep they have or what mods have been done to it. If it's 4-wheel drums, then there's no purpose to the prop valve.

It's just there because the volume for the calipers is larger than the drum cylinder, and so when the master pushes enough fluid to make the caliper work, it locks the rear up hard. So, as Drednot said, you put a prop valve in to proportion the amount of fluid going to the front vs the rear when braking. <- Wrong

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Last edited by project_mercy; 08-23-2017 at 05:21 PM. Reason: Price is Wrong
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post #8 of 17 Old 08-23-2017, 11:22 AM
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For a better explanation of how and why...

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Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #9 of 17 Old 08-23-2017, 03:54 PM
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Yep, it's not connected. It's a 1990 YJ I bought last month for a project. Frame and body in good shape. 4.2L carb engine with 264k miles. A999 auto trans with 20k on the rebuild. Front disk haven't even looked at the back brakes. Not got that far. I'm reading the thread about putting 4.0L head on 4.2 L block. Engine has a rod slapping and low compression so it's time for a rebuild or replacement engine. My past jeep experience is from the 80's. Had a 75 cj5 new and a 79 cj7 till '86. Just bought a '01 GC limited a couple years ago for a tow vehicle behind the RV. Out of town for a couple weeks I'll look at rear brakes upon return. Got windshield and dash torn down now. Maybe I'll start my own tread on this rebuild. But, this is the best site/forum for jeeps!!! I'll watch the video you posted on the prop valve. Thanks!'

Last edited by mikwallace; 08-23-2017 at 07:48 PM.
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post #10 of 17 Old 08-23-2017, 05:16 PM
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For a better explanation of how and why...
Man, Klowns are wonderful.

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post #11 of 17 Old 08-23-2017, 07:48 PM
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Man, Klowns are wonderful.
Considering proportion valves were used on pickups with 4 wheel drum brakes, before disks were ever offered...and considering proportion valves regulate pressure, not volume, I think the Klown's explanation makes a lot more sense than yours did.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #12 of 17 Old 08-23-2017, 08:58 PM
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Considering proportion valves were used on pickups with 4 wheel drum brakes, before disks were ever offered...and considering proportion valves regulate pressure, not volume, I think the Klown's explanation makes a lot more sense than yours did.
I think you mistook my reply for sarcasm. I enjoyed the video, which is why I liked it and I even updated mine to flag it as incorrect. I will attempt to avoid replying in the future.

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post #13 of 17 Old 08-23-2017, 09:01 PM
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I think you mistook my reply for sarcasm. I enjoyed the video, which is why I liked it and I even updated mine to flag it as incorrect. I will attempt to avoid replying in the future.
Sorry I misunderstood. Mea culpa.

Bill
Dodge did not build my Jeep.
1988 Wrangler,4.2L I-6, Howell EFI JP-1,CRT HEI Ign,AX15 ext slave conversion, Zone 2.5" lift + 1/2" booms, BFG 31 x 10.5, Bestop.
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post #14 of 17 Old 08-23-2017, 09:05 PM
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Quote:
Originally Posted by Mr.B View Post
So you're saying that this is in your Jeep, but not hooked up?




Let me clarify "not hooked up". The electrical connector is not connected.


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post #15 of 17 Old 08-23-2017, 10:54 PM
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That's good. But the electrical connector is just there to tell you if there is a problem.

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