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Help needed with nightmare XJ ABS to Non-ABS swap...


NAXJA Forum User
Hello everyone,

I'm new to the forum so I apologize if this has been answered many times before. I'll continue to search the threads for answers. In the meantime here's my ABS to non-ABS swap issues:

I have a 1991 Jeep Cherokee Laredo (automatic, 4.0 6 Cylinder, 4 door, 4WD) with ABS (Bendix 9). I removed pretty much all of the ABS equipment from the engine bay. (I bought 2 Jeep ZJ booster/MC combinations from junkyards - both had issues - so both were RETURNED)...

OK, so I just bought a NEW (remanufactured) Cardone 54-73151 Vacuum Power Brake Booster and a BRAND NEW Dorman M390303 Brake Master Cylinder. I bench bled the MC and all brake lines. The right rear 1st then LR,RF,LF. Right Rear had a lot of air in the lines.

Below is an image of the original 1991 XJ proportioning valve I have paired with the new Booster and MC.


***The brake pedal seems decent when the Jeep is off but when I turn it on the pedal gets soft. Also I hear a very slight vacuum leak that seems to be near the back of the booster.

<>Should the original PV valve work with this system? Do I have it plumbed correctly? There are no known leaks, MC remains topped off with soft pedal and Jeep running.

BTW I just ordered a brand new Brake Proportioning Valve replacement for Jeep Wrangler CJ XJ YJ Cherokee 1987-1996 PV8796J... in case the original PV is the culprit.

<> I don't know if this would effect things but I have not yet removed any ABS fuses.

Any advice or troubleshooting tips would be greatly appreciated!!!

BTW, this same post is on other Jeep site(s)... so sorry if you're tired of seeing it. Just trying to get help to solve my Jeep brake issues.