What was found
PILOT REPORTED LEFT BRAKE WENT TO FLOOR, NO BRAKE, WHICH LEAD TO THE ACFT DEPARTING THE TAXI WAY. INSPECTED THE LT BRAKE SYS, MASTER CYLINDER & HYD LINES CHECKED OK. HYD FLUID AT BRAKE CALIPER. R & R CALIPER & BLEED BRAKE SYS. OPERATIONAL CHECK GOOD IAW MM CH 32-40-00. INSPECTED NLG, LT & RT MLG FOR CONDITION & SECURITY, NO DEFECTS NOTED.