As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) BOTH LEFT AND RIGHT MASTER CYLINDERS ON THE CO-PILOTS SIDE FAIL TO PRODUCE ADEQUATE PRESSURE FOR BRAKING. PILOT'S CYLINDERS SEEM TO WORK WELL. THE SUBMITTER STATES THAT THE FLUID IN THE CYLINDERS APPEARS DIRTY AND SPECULATES THAT THERE COULD BE SOME O-RING DETERIORATION.