As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON LANDING, PILOT LOST RT BRAKE PEDAL ACTUATION AS WELL AS RT BRAKE CAPABILITIES. INITIAL GVI-VISUAL INVESTIGATION REVEALED RT BRAKE MASTER CYLINDER PISTON ROD PN 0541143, BROKEN AT BASE BELOW CLEVIS CHECK NUT PN 0541140. UPON DVI-VISUAL INSPECTION THE CLEVIS AND CHECK NUT WAS FOUND TO HAVE BEEN BOTTOMED OUT ON THE PISTON ROD CAUSING CONTACT WITH THE RT RUDDER/BRAKE PEDAL SHAFT ATTACHMENT HORN, THIS CONDITION CAUSED THE SHAFT TO SHEAR BELOW THE CHECK NUT AND THE SEQUENTIAL LOSS OF BRAKE CAPABILITIES.