D44a swap into my 93 with drums... ? - JeepForum.com
 
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post #1 of 9 Old 07-01-2009, 11:31 AM Thread Starter
aaron7
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D44a swap into my 93 with drums... ?

Still looking for someone parting a 97-98 V8 ZJ so I can get my D44a, but I was wondering about something.

I have a 93 with rear drum brakes. I don't have ABS (well, I do, but it's all unplugged).

Can I just install the D44a and be done? Or is there more to the rear disk conversion?

What about the e-brake?


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post #2 of 9 Old 07-01-2009, 11:37 AM
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you need the ebrake cables that go from the axle to the bracket on the undercarriage of your jeep... the drum brake cables will not work

since your not hooking up your ABS... that is all you will need to get it to work

Matt


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post #3 of 9 Old 07-01-2009, 11:43 AM Thread Starter
aaron7
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So no need for a proportioning valve or anything like that?

And do I just need the cables for the e-brake or brackets and such too? I'll just order new cables if that's all I need.

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post #4 of 9 Old 07-01-2009, 11:56 AM
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you just need the cables.. they hook into the same bracket ( thats bolted to the underbody of the ZJ ) as your D35 cables

Matt


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post #5 of 9 Old 07-01-2009, 02:56 PM
rm2001wj
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Quote:
Originally Posted by aaron7 View Post
So no need for a proportioning valve or anything like that?

.............
Actually, what you have is a combination valve which contains a pressure differential valve and switch and a rear proportioning valve. With disc brakes, the pads are very close to the discs so they don't have to move very far to make contact. With drum brakes, the shoes are not so close to the drum so they have farther to move before contact is made. The combination valve causes the shoes to move and almost make contact with the drums before the front disc pads start to move. The idea is to not let the front brakes be applied before the rear brakes which could cause instability when braking. The rear proportioning valve, as you know, proportions fluid pressure so the the front brakes provide the correct majority portion of the braking action.

With rear disks, you won't need the rear pads to move before the front pads because the front and rear pads move the same distance. If you use the 93
combination valve with disc brakes, the rear brakes are likely to be applied before the front brakes. Also, I would expect the proportion of fluid pressure sent to the rear drums would be different than what is needed for rear discs.

Bottom line is that I think it would be best if you replaced the 93 combination valve with one from a 97-98 if at all possible.
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post #6 of 9 Old 07-01-2009, 04:11 PM
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Quote:
Originally Posted by rm2001wj View Post
*bunch of very important techy info*
I 100% agree. Going from drums to discs is a little more complicated than just slapping them in and making sure they're getting fluid.

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post #7 of 9 Old 07-01-2009, 04:30 PM Thread Starter
aaron7
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That's what I thought. If I replace my combo valve with a later one I'll be OK?

Where... and what is this thing btw?

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post #8 of 9 Old 07-01-2009, 04:45 PM
CLNinja
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ive been driving mine with the 93 valve for a while now and it works just fine

Matt


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post #9 of 9 Old 07-01-2009, 06:00 PM
rm2001wj
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Quote:
Originally Posted by aaron7 View Post
That's what I thought. If I replace my combo valve with a later one I'll be OK?

Where... and what is this thing btw?
The attached pic shows what it looks like and where it's located on a 97-98. It's next to the master cylinder and brake booster. I guess it would be similar for a 93, but I can't be sure.
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