As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LANDING ROLLOUT COPILOT BRAKES PERFORMED ABNORMALLY; SEVERAL PUMPS REGAINED PRESSURE. DURING TAXI STEADY BRAKING RESULTED IN DECREASING PRESSURE WITH LT PEDAL REACHING FLOOR. REPLACED LEFT MIXER VALVE IAW MM 32-40-00. OPS AND LEAK CHECKED GOOD.