CAPT OF ACFT MADE A MECH IRREGULARITY WRITE UP IN THE ACFT LOG THEN AFTER CONSULTATION WITH MAINT FLEW THE ACFT TO THE NEXT STOP WHERE MAINT WAS ACCOMPLISHED.

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UNDER INCREASED PRESSURE FROM COMPANY TO NOT GIVE 'VERBAL SQUAWKS'; I WRITE UP A DISCREPANCY IN THE PROPER FLT LOG OF A LEAKING PNEUMATIC BRAKE ASSEMBLY. PNEUMATIC ACCUMULATOR BOTTLE DRAIN WAS NOT EVIDENT AND BY RELEASING THE PARKING BRAKE VERY SLIGHTLY; ALL LEAKS STOPPED. SINCE I HAD AN 'OPEN WRITE-UP' I HAD GUAM OPS HAVE GUM MAINT TELEPHONE ME AT ROTA OPS TO DISCUSS FURTHER ACTION. WE (THE MECH AND I) BOTH AGREED THAT THE PARKING BRAKE SYS WAS THE CULPRIT; BUT SINCE IT WAS NOMINALLY OPERATIVE; BUT NOT INOP; THAT THE ACFT WAS STILL AIRWORTHY FOR REVENUE FLT; AND MAINT CTL IN IAH NEED NOT BE ADVISED. ALL PRECAUTIONS TO INSURE SAFETY WERE OBSERVED; DOUBLECHKING OF THE ACFT; COM OF POSSIBLE PROBLEMS GND AND FLT CREW; RECHKING OF PNEUMATIC BOTTLE PRESSURE TO INSURE COMPLIANCE WITH PNEUMATIC PRESSURE LIMITATIONS AND REINSTATEMENT OF PARKING BRAKE PRIOR TO PAX BOARDING WITH BRAKES HELD THROUGHOUT START-UP. UPON ARRIVING AND TERMINATING IN GUM; AIR LEAK CONTINUED. WAS WRITTEN UP AND SUBSEQUENTLY DIAGNOSED AND REPAIRED WITHOUT INCIDENT. THE PARKING BRAKE AND BRAKES WERE AT ALL TIMES OPERATIVE -- ONLY MINOR LEAKS. SINCE THERE WAS AT NO TIME AN 'INOP' SYS; I FELT THE AIRWORTHINESS OF MY ACFT WAS NEVER IN DOUBT. HAD I NOT WRITTEN UP THE DISCREPANCY IN ROTA AND FLOWN TO GUM; I WOULD HAVE VIOLATED COMPANY PROCS AND THEREBY VIOLATED FARS. IN GUM; I THEN WOULD HAVE VIOLATED COMPANY PROCS/FARS BY NOT WRITING UP THE DISCREPANCY WHEN AND WHERE IT OCCURRED. AFTER CONSULTING GUM MAINT; I WAS ADVISED THAT IT WAS SAFE AND LEGAL TO SIGN OFF THE LOGBOOK MYSELF AND FLY THE CONTINUATION OF THE FLT TO GUM. THE MECH REITERATED 3 TIMES; 'FLY IT!' WHEN QUERIED ABOUT THE SIGNOFF; LEGALITY; AND SAFETY. ALTHOUGH I WILL NOT MAKE THE SAME DECISION AGAIN; I DO FEEL THERE IS SOME GRAY AREA BTWN AN OCCASIONAL IRREGULARITY; A CHRONIC PROBLEM; AND AN INOP SYS; THAT IS NOT ADDRESSED BY COMPANY POLICY/PROCS; FARS; OR THE MEL. THE DECISION TO FLY MUST COME FROM THE EXPERIENCE AND JUDGEMENT OF THE GND AND FLC; WITH SAFETY AND LEGALITY AT THE FOREFRONT UTILIZING TOTAL SUPPORT FROM THE FAA; COMPANY; MAINT; AND MANUFACTURER.