ZJ Proportioning valve question...

Ben824 · Jul 26, 2011

I am gathering parts together to do a ZJ rear disk brake conversion on an 87 XJ D44 that I will be swapping in soon. I have the backing plates, calipers, etc. but I am unsure of which proportioning valve to use. The ZJ I pulled the parts from had ABS brakes and I didn't want to pull the wrong one if ABS made a difference. Can anyone tell me if ABS proportioning valves make a difference or not?

clean4drxj · Jul 27, 2011

I dont think abs will effect it, i know it doesn't on my 96 XJ

O-Gauge Steamer · Jul 27, 2011

go to rockauto's or Napa's web site and compare part numbers...

Talyn · Jul 27, 2011

While you can use Rockauto for boosters and master cylinders, they don't list the prop valve so you can't compare there. AFAIK its a dealer only item.

RedChuck · Jul 27, 2011

i have don't have abs and its barely different. only time i have noticed it was during a panic stop in the snow. the backs locked up first. i asked that question before and i think most responses said forget about it. i have an adjustable pv in my garage i was going to add it when i upgrade the front to wj parts and some line locks all around

my biggest issue was getting the e brake right

markaboo929 · Jul 27, 2011

I used just the small plunger and cap out of the prop valve can't remember if it was abs or not-but it worked much better than the stock 88 xj one..plus I have used the WJ booster and master on mine-stops real good with 35's.I have driven a stock 88 set up and it is much better than the factory size/lift/tires.

gradon · Jul 27, 2011

I'm using the 1/2" shorter ZJ prop spring. My rears lock up first, which is good, but I'd like to play with an adjustable valve so I can swing it to the fronts locking up first then back it off until the rears lock a fraction before.

Talyn · Jul 27, 2011

markaboo929 said:
I used just the small plunger and cap out of the prop valve can't remember if it was abs or not-but it worked much better than the stock 88 xj one.

Thats not what I am asking. I have that already.

gradon said:
My rears lock up first, which is good, but I'd like to play with an adjustable valve so I can swing it to the fronts locking up first then back it off until the rears lock a fraction before.

You don't want the back to lock up first. You want the front to for safety reasons.

seanyb505 · Jul 27, 2011

I think for racing it's different.

Talyn · Jul 27, 2011

Talyn said:
Thats not what I am asking. I have that already.

Oops.. just realized I put that in the wrong thread. I'm following two prop valve threads right now. Disregard.

seanyb505 said:
I think for racing it's different.

Possibly, but for general purpose and intent in this thread its front first.

nwautoxer · Jul 28, 2011

I have an '87 XJ D44 with '94 ZJ non-ABS rear disk brakes in my '98 non-ABS XJ (on 35" tires). I'm using the stock '98 XJ proportioning valve and can stand on the brakes and have very good stopping power without rear brake lockup. Other folks have commented on not needing to change the prop valve and I agree with them, at least with regard to my '98.

Suggest you try the stock prop valve first and only change to a ZJ prop valve (or guts) if you don't find the braking to be satisfactory.

My biggest issues were getting a really good brake bleed and the right parking brake cable setup.

Ben824 · Jul 28, 2011

nwautoxer said:
I have an '87 XJ D44 with '94 ZJ non-ABS rear disk brakes in my '98 non-ABS XJ (on 35" tires). I'm using the stock '98 XJ proportioning valve and can stand on the brakes and have very good stopping power without rear brake lockup. Other folks have commented on not needing to change the prop valve and I agree with them, at least with regard to my '98.

Suggest you try the stock prop valve first and only change to a ZJ prop valve (or guts) if you don't find the braking to be satisfactory.

My biggest issues were getting a really good brake bleed and the right parking brake cable setup.

I will do that then. No sense in getting something I don't need.

What did you do for the e-brake cables? Thats the other thing I am trying to figure out.

ZJ Proportioning valve question...

Ben824

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clean4drxj

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O-Gauge Steamer

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Talyn

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RedChuck

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markaboo929

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gradon

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Talyn

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seanyb505

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Talyn

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nwautoxer

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Ben824

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