What was found
UPON LANDING IN BOCA, COPILOTS (RIGHT SIDE) LEFT BRAKE PEDAL HAD NO PRESSURE OR BRAKING, EVEN AFTER 2 OR 3 PUMPS. SOME BRAKING WAS RESTORED AFTER 5-7 PUMPS ON CAPTAINS LEFT BRAKE PEDAL. SUPPLEMENTAL INFORMATION, REPLACED COPILOTS LT MASTER CYLINDER WITH A NEW CYLINDER. RETORQED PRESSURE B-NUT IN PEDESTAL FWD AREA. PERFORMED SATISFACTORY BLEED, LEAK, OP'S CHECK OF BRAKE SYSTEM IAW EA 500 M/M 32-41-11, 20-05-00, 32-40-00.