As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXI OUT THE BRAKE SYSTEM WAS GRABBING AND NOT SMOOTH, THE PAX IN BACK EVEN FELT THE BRAKES GRABBING AND NOTED IT BEING SOMETHING THEY HAVE NEVER FELT. IT FELT LIKE ONE WAS STUCK AND SHUTTERING. COULD NOT DETERMINE WHICH SIDE I THINK IT WAS BOTH. INSTALLED REPAIRED BCU PN DAP00100-11 SN 501710642. WORK DONE IAW EM505 AMM 32-41-01.