As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING TAXI IN WHILE ATTEMPTING TO BRAKE AIRCRAFT REQUIRED MORE PEDAL TRAVEL THAN NORMAL AND HAD A SPONGY FEEL. FOUND RESERVOIR PISTON ON 2624 GM FULLY DEPRESSED BELOW THE RED BAND . ACCOMPLISHED FILLING AND BLEEDING OF THE LOW PRESSURE CONTROL SYSTEM OF THE ALTERNATE BREAKING. OPS CHECKS NORMAL REF AMM 32-43-00-612-001-A .