Brake pedal vibration

StaceyB said:
Even though it’s not been that long since my last rotate/balance/align, I’m going to do that again and hope for the best. I talked to a local tech and he thinks if that doesn’t work and the ECU won’t clear, I may need a new WCM and reprogramming. Let’s hope it’s not that.

Thanks for everyone’s thoughts. I’ll update after the next round of tries.
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The tires won't make the brake pedal pulsate.
 
vaffanculo said:
This is mind boggling. We know something is causing this issue in a wheel sensor,abs sensor and the tpms...something is not syncing right causing the brake pedal to vibrate .just a stupid question, are all the tires the exact same size and same tread? Also when your driving along is there any vibration at the steering wheel if you let go? Also if your driving in a straight line and you hit the brakes is the jeep wandering to one side or the other or a pulling sesention? Another thing came to mind ,try driving with your traction control on and see if the pedal vibrates and also try it with the 4 wheel drive on and see if the pedal vibrates...
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No improvement after balance, rotate and align.

My caster is at 2.5. The place I took it couldn’t adjust it more than that, but everything else is good.

Had a 4x4 shop look at front and rear track bars, drag link and double check rear rotors and calipers. All good there.

Still have the “ECU configuration mismatch” code that nothing will clear. Still no lights coming on, not even when the pedal grab happens.

Up next trying to reprogram the WCM to clear the ECU code. After that, I’m out of ideas and no shop I’ve asked has seen this issue.
 
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StaceyB said:
No improvement after balance, rotate and align.

My caster is at 2.5. The place I took it couldn’t adjust it more than that, but everything else is good.

Had a 4x4 shop look at front and rear track bars, drag link and double check rear rotors and calipers. All good there.

Still have the “ECU configuration mismatch” code that nothing will clear. Still no lights coming on, not even when the pedal grab happens.

Up next trying to reprogram the WCM to clear the ECU code. After that, I’m out of ideas and no shop I’ve asked has seen this issue.
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What about the front rotors they are used more then the rears.
 
If you go to the initial post, you’ll see the long list of everything we already tried. It has new rotors, calipers, brake pads, and wheel bearings on front and new wheel speed sensors all the way around.
 
StaceyB said:
If you go to the initial post, you’ll see the long list of everything we already tried. It has new rotors, calipers, brake pads, and wheel bearings on front and new wheel speed sensors all the way around.
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I did read the first post but just because they are new doesn't mean they aren't warped, if they are cheap Chinese they could be. A warped rotor will make your brake pedal pulsate as you apply the brakes. You've eliminated everything else what else could it be.

I've read where people have bought new brake drums and they had to get them turned so they wasn't warped.
 
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BLACKJKU said:
I did read the first post but just because they are new doesn't mean they aren't warped, if they are cheap Chinese they could be. A warped rotor will make your brake pedal pulsate as you apply the brakes. You've eliminated everything else what else could it be.

I've read where people have bought new brake drums and they had to get them turned so they wasn't warped.
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Wasn’t being snarky about the long list … was just too lazy to type again.

Multiple people have looked at the new front rotors and the old rear rotors and can find nothing visibly wrong with any of them (no grooves, warping, etc). So, I don’t know.

Techs at the local Jeep dealership are leaning toward an electronics issue with something triggering the ABS. That’s why they suggested reprogramming the WCM to see if it will clear the wireless control TPMS code (since we have done everything else to try to clear it (battery and pulling PCM fuse) and it comes back on every rescan). I’ve used multiple OBD readers, cleared JScan multiple times. Even deleted the app and did a new install.

At some point, I have to stop just tossing money for new parts, but it’s driving me nuts…
 
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StaceyB said:
I have not. TBH, I was kinda nervous about driving with it off; not that I plan to take any hard or sharp turns if it is.
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If the ESC is what's causing it your dash should light up and say ESC with squiggly lines when it's doing it.

If your steering wheel isn't centered when driving straight it can make the ESC do it's thing. When the ESC is doing it you'll feel all 4 brakes doing the ABS thing. The ESC is mainly for in the winter time if your Jeep would start fishtailing supposedly to keep you going straight.
 
StaceyB said:
No improvement after balance, rotate and align.

My caster is at 2.5. The place I took it couldn’t adjust it more than that, but everything else is good.

Had a 4x4 shop look at front and rear track bars, drag link and double check rear rotors and calipers. All good there.

Still have the “ECU configuration mismatch” code that nothing will clear. Still no lights coming on, not even when the pedal grab happens.

Up next trying to reprogram the WCM to clear the ECU code. After that, I’m out of ideas and no shop I’ve asked has seen this issue.
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Thinking now maybe your axle is bent or your frame ..im leaning toward your axle...sorry too hear about this but the axle is an easy shade tree fix
 
BLACKJKU said:
If the ESC is what's causing it your dash should light up and say ESC with squiggly lines when it's doing it.

If your steering wheel isn't centered when driving straight it can make the ESC do it's thing. When the ESC is doing it you'll feel all 4 brakes doing the ABS thing. The ESC is mainly for in the winter time if your Jeep would start fishtailing supposedly to keep you going straight.
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I'm thinking mainly of the roll mitigation portion of the strategy. If it is similar to other OEMs it will aggressively activate a particular brake (or pair) to shift inertia and avoid a roll event. Now, if that is a part of the issue there must be something else wrong as well... First step is to confirm or rule it out.
 
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