What was found
BRK FAIL YELLOW CAS: DURING LANDING ROLL OUT THE FLYING PILOT NOTICED REDUCED BRAKING EFFECTIV ESS. ONCE THE AIRCRAFT WAS SLOWED DOWN ENOUGH FOR EXITING THE RUNWAY, THE PEDALS WENT TO THE FLOOR AND THE BRK FAIL YELLOW CASS DIPLAYED. WE HAD TO USE THE PARK BRAKE TO FULLY STOP. AIRCRAFT WAS TUGGED INTO SIGNATURE. REMOVED SUSPECT BCM FOR BRAKE FAIL ON LANDING ROLL OUT. INSTALLED REPAIRED THE BCM. COMPLIED WITH OPS FUNCT CHECKS, COMPLIED WITH HYD SYS BLEEDING. LEAK CHECKED. CHECKED GOOD. WORKED IAW AMM 32-41-07.