As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT TAXI SPEEDS OF 15 MPH AND LESS, BOTH BRAKES GRAB INTERMITTENTLY AND INDEPENDENTLY OF EACH OTHER. THE BRAKES CAUSED THE AIRCRAFT TO LURCH AND SHUDDER. REMOVED & REPLACED FAULTY BRAKE METERING VALVE IAW C560XL M.M. 32-44-20. OPS & LEAK CHECK GOOD.