Modified XJ Cherokee Tech XJ (84-01)
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brake upgrade (MC and booster)

Old 03-21-2017, 01:52 PM
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Default brake upgrade (MC and booster)

Hi guys. So this summer I upgraded my rear end to discs from a grand cherokee. way better braking now, but I do have a problem. My pedal is very spongey even after flushing and bleeding it like 4 times. I think my MC is starting to go out. Some days the pedal is nice and i have good stoppage, other days it feels really soft with a lot of travel, and i have to really lay into the pedal to stop. I did some reading and it looks like there are some upgrade options out there from dodges or the WJ. I have a 2000 so I think my booster is the best one possible (???) I just need some guidance on what MC and booster to get. Thanks
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Old 03-21-2017, 04:04 PM
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99 WJ Booster and ZJ prop valve. just have to re-do the flare nuts on the booster lines.
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Old 03-21-2017, 08:51 PM
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isnt the wj booster pretty much the same as stock for 2000?
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Old 03-22-2017, 04:30 AM
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I'm sure Cruiser will chime in soon, but until then I'll quote what he told me when I did mine. I have a 90, so the WJ booster with ZJ prop valve guts was an awesome upgrade. My understanding is the 2000 is already a good setup. You might swap the prop valve internals to see a better balance in brake biasing.

Probably just time to replace the master cylinder with a stock replacement.
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Old 03-22-2017, 07:40 AM
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Originally Posted by bad_idea View Post
I'm sure Cruiser will chime in soon, but until then I'll quote what he told me when I did mine. I have a 90, so the WJ booster with ZJ prop valve guts was an awesome upgrade. My understanding is the 2000 is already a good setup. You might swap the prop valve internals to see a better balance in brake biasing.

Probably just time to replace the master cylinder with a stock replacement.
You beat me to the punch. LOL.
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Old 03-22-2017, 07:43 PM
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i have the zj prob valve. and yeah i knew the 2000s were pretty well set. just seeing if there was an upgrade. any info about the durango MC?
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Old 03-24-2017, 02:58 PM
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Originally Posted by bad_idea View Post
I'm sure Cruiser will chime in soon, but until then I'll quote what he told me when I did mine. I have a 90, so the WJ booster with ZJ prop valve guts was an awesome upgrade. My understanding is the 2000 is already a good setup. You might swap the prop valve internals to see a better balance in brake biasing.

Probably just time to replace the master cylinder with a stock replacement.
Would this also work on an 85 with rear drums? Would you also need the prop valve with that or would that not be compatible?
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Old 03-24-2017, 04:44 PM
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On the 85 you should be able to just swap in the WJ booster and master. You only need to mess with the prop valve if you add disc brakes. Cruiser is the subject matter expert, so I would verify with him.
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