As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLEMENTAL FLIGHT: 3909 AFW/AFW DURING BRAKE CHECK FIRST OFFICER'S RIGHT BRAKE PEDAL WENT TO THE FLOOR MINIMAL BRAKING CORRECTIVE ACTION: REPLACED METERING VALVE PERFORMED OPERATIONAL TEST OF THE NORMAL BRAKING , SYSTEM OPERATIONAL CHECKS GOOD.