Pulse/popping in break pedal

Hey TW,

Started feeling a pulse or a poping feeling in the break pedal only when I come to a stop. Also feel it on take off. I let go of the break and push the gas and still feel it. I've rolled down the windows to see if I can hear anything and nope no noise. Just feel it in the pedals.

I have 885s with 5100 set at .85 with an aal in the back also new LR UCA.

Any help or ideas

 

Bump

 

ABS activating.
Different size tires?

 

Yes on the tires. Went from 245/75/16 to a 265/75/16. That shouldn't make that big of a difference.

I'm not sure about this abs. I'm gunna pull the fuse and take it for a drive to see if it still does it.

Its wired I could be backing out of the garage and still have the foot on the break to go slowly and it feels a like some end on the other side is hitting the break. It's not really a vibration. Feels like a thud at slow speeds. I'm talking below 5 mph. when the tires rotate I feel thuds only in the pedal. I dunno this is frustrating

 

I meant different size tires on different axles/wheels.