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Old July 19th, 2013, 09:37 AM   #1
Sandster
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Default rear disc brake swap question

I just swapped in an 8.8 in my 03 TJ and wondering if i need to do anything to the proportioning valve. Someone told me no and some had said i do. Anyways what do i need to do and where is said valve?
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Old July 19th, 2013, 10:55 AM   #2
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I don't know if this helps or not. But I had a Ranger and swapped a drum brake 8.8 for a disc brake 8.8 out of a Explorer and did not have any problems with brakes at all. So I don't think you should have a problem.
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Old July 19th, 2013, 12:08 PM   #3
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Didn't on my 91 xj
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Old July 19th, 2013, 12:36 PM   #4
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I added disc brakes to my rear D60 ( '79 J20) no other changes .......no noticeable problems as yet.
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Old July 19th, 2013, 02:40 PM   #5
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i know a few of the sites that talk about 8.8 swaps tell you "you may or may not need a new proportioning valve" i never bought one, my rear brakes always worked good.
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Old July 19th, 2013, 05:38 PM   #6
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How I understand this situation: (I could be wrong)

Drums require less pressure to operate, a factory prop valve regulates pressure to the rear. So when swapping discs on they will still see pressure and work but work better when pressure to both front and back are equal.

I run an open block.
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Old July 19th, 2013, 06:58 PM   #7
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What if you have ABS, will they work right
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Old July 19th, 2013, 08:13 PM   #8
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i swapped disks into the back of my 02 TJ D44. I pulled the plunger out of the PV and pulled a rubber seal. There are directions online. It works great for me.
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Old July 20th, 2013, 02:29 PM   #9
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Quote:
Originally Posted by Dylan View Post
i swapped disks into the back of my 02 TJ D44. I pulled the plunger out of the PV and pulled a rubber seal. There are directions online. It works great for me.
This is exactly what I did. Improved stability while standing on the brake pedal.

It seemed to shuffle a bit before I gutted my prop. Valve.
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