As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. AIRCRAFT ABORTED TAKEOFF AT 40 KNOTS DUE TO AIRCRAFT YAWED TO THE RIGHT DURING TAKE OFF ROLL, VIBRATION FELT IN BRAKE PEDAL. TROUBLESHOOT FOUND HYDRAULIC SYSTEM A AND B SCHRADER VALVE LOOSE AND LEAKING. 0 HEAD PRESSURE. TIGHTENED AND SECURED SHRADER, AND SERVICE BRAKE PRESSURE. PER FIM 32-44-00-810.