A FALCON 50 HAD THE L BRAKE FAIL ON 2 CONSECUTIVE FLTS. THE FO ON BOTH FLTS; A LICENSED A&P TECHNICIAN WITH INSPECTOR AUTH TAXI TESTED THE ACFT AND CLRED THE LOG RPT.

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ON AUG/FRI/00; I FLEW AS FO TO MINNEAPOLIS; MN. UPON LNDG THE L BRAKE WAS INOP. #2 SYS WAS SELECTED AND NORMAL BRAKING RETURNED. THE NEXT DAY MAINT AT WXXX REPLACED THE L INBOARD BRAKE ASSEMBLY AND THE R OUTBOARD ASSEMBLY DUE TO BEING AT THE SERVICEABLE LIMIT. LATER THAT DAY THE ACFT WAS POSITIONED TO HOME BASE; ZZZ; US. UPON LNDG; THE SAME PROB OCCURRED. AGAIN NORMAL BRAKING WAS ACHIEVED BY USING #2 SYS. AT THAT TIME THE CAPT MADE AN ENTRY IN THE FLT LOG ESSENTIALLY GROUNDING THE AIRPLANE. ON AUG/SAT/00; THE OWNER/OPERATOR (AXZ BBBB OF YYY AVIATION) ASKED ME TO CHK THE AIRPLANE SINCE THE COMPANY MECH DID NOT HAVE JACKS NOR A HYD MULE TO TEST THE SYS PER THE MAINT MANUAL. I TAXIED THE AIRPLANE AROUND AND NO BRAKE PROBS EXISTED. ALL SYS PERFORMED NORMALLY. SINCE I AM ALSO AN ACFT MECH WITH INSPECTION AUTH; I ELECTED TO RETURN THE ACFT TO SVC AFTER THIS MAINT RUN-UP. I MADE AN ENTRY IN THE FLT LOG EFFECTIVELY SAYING THAT A FUNCTIONAL CHK WAS PERFORMED AND NO ABNORMALITY WAS FOUND. AT THE TIME; I BELIEVED I HAD THE RIGHT TO MAKE THAT ENTRY. THE COMPANY MECH REFUSED TO RETURN THE AIRPLANE TO SVC. I DEEPLY REGRET ANY DIRECT OR POTENTIAL THREAT TO SAFETY BY RELEASING THIS AIRPLANE TO SVC. PART OF THIS PROB THAT LED TO THIS SIT IS THAT THE ACFT IS ON AN FAR 135 CERTIFICATE THAT IS BASED AT ANOTHER ARPT (XXX; US). THE OPERATOR OF THE ACFT; AXZ BBBB; OWNER OF YYY AVIATION; RUNS THIS ACFT OUT OF HIS KITCHEN IN AXBX WITH HIS WIFE. IN SHORT; HIS OP IS SOMEWHAT ABSENTEE. IF THIS OPERATOR HAD THE APPROPRIATE SUPPORT EQUIP; IE; JACKS TO JACK THE ACFT AND A HYD MULE AT HIS HOME BASE TO PROPERLY CHK THE HYD SYS; THE PROPER CHKS AND TESTS WOULD HAVE BEEN ACCOMPLISHED AND THE PROB SOLVED AT HOME BASE. THE FAA CALLED THE CERTIFICATE HOLDER; MXZY AVIATION. THEY HAD NO KNOWLEDGE OF THIS WHOLE OCCURRENCE. THE COMPANY MECH WAS NOT KEEPING MXZY INFORMED; AS HE SHOULD HAVE PER THE OPS MANUAL. IN ADDITION; THE MECH CALLED THE FAA ON AUG/SAT/00 PM; SEEKING A FERRY PERMIT. THEY REFUSED TO GIVE HIM ONE. I AM NOT SURE WHY AT THIS TIME. WHEN THE FAA LOOKED AROUND FOR THE PLANE AUG/MON/00 AM; AND IT WAS NOT THERE; YOU CAN IMAGINE THEIR INQUIRY.