On my friend's sister's 91 they had to remove everything. He said she had an issue where it wouldn't let her put on the brakes, so they removed all the ABS stuff from the vehicle. I just texted him and he said it was a 91. And that is what was worrying me about it as far as my XJ.
However he says it is still better to remove it all on the 92 and up also.
So what is the difference between the "early" and "late" years that you say you can just remove fuses and relays?
This is the Bendix ABS system on 91 and older vehicles. (pump and accumulator not pictured, but are located on passenger side of engine bay)
It is necessary to remove the entire system on a '91 and older because the system does not use a vacuum assisted booster, but an electronic pump, an accumulator, and a modulator. Pulling the fuse/relay for this will disable the system because the system uses the electric pump to create pressure to apply the brakes. No power to pump, and no signal to the modulator will leave you with no fluid pressure, and manual brakes that barely work. I know this from experience, as I had to remove and replace my ABS unit in my '91. The PO had replaced the entire system from the dealer 2 years prior to me purchasing it, and it still failed.
This is a dual diaphragm booster and ABS unit from a '99, (should be same as '96)
It is not necessary to remove the entire ABS unit on a jeep without the Bendix ABS unit, since it is a separate module from the diaphragm booster. The booster (the black circular canister on the firewall, which is operated by your foot and vacuum) is what creates the necessary pressure to pump the fluid through the lines. This pressure then passes through the ABS module, which will sit dormant, and allow the pressure to pass through the system to the brakes. The module's dormant and un-powered state is all lines open, and will not restrict pressure to any lines unless a sensor tells it to. Therefore, it is not necessary to remove the entire system, removing just the fuse and relay will allow the brakes to function correctly, without ABS. I know this from experience, not just something I read online.
I have heard from some others that just disconnecting the electrical stuff will not sufficiently disable the abs system as that there is a possible malfunction in the system that could prevent one from being able to apply the brakes as the computer wouldn't allow the brakes to work.
The ABS system is a stand alone module. It does not go through the computer, in fact none of the brake system in a Cherokee goes through the computer. To apply the brakes, you put your foot on the pedal, which attaches to the booster via a rod, which uses the vacuum from the engine to push the rod in the master cylinder, which pushes fluid through the lines. The ABS module takes power from the PDC through its own wire harness (which is integrated into the big corrugated looms in the engine compartment), and has the two front sensors connect in the engine compartment. It then has a separate interior harness that connects the 2 rear sensors, as well as a gravity sensor under the rear seat, and that is it. I actually have the entire ABS unit and wiring separated from my old '99 to put in my '91, since it is a DD and I prefer ABS.
depending on which fuses maybe. but that is not a guarantee. i have had my ABS fuse pulled from under my dash and my brakes work fine, have for years. pump still makes noise and everything. but yes the BEST, and probably RIGHT way is to swap it all over to a traditional boster/MC setup
As we told you in a previous thread, you did not disable your system.
Don't say that it is not a guarantee when you in fact did not do anything to your system. The fuses/relays to the ABS system are under the hood in the PDC, there is not an ABS fuse under the dash (
Fuse layout here). You even verified that it is working by saying that your pump still makes noise. Obviously its not disabled.
And that is definitely a consideration.
