B727 CREW WAS GIVEN AN 'OK TO CONTINUE' ON A HYD BRAKE PROB.

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ALL OPS WERE NORMAL UNTIL PUSHBACK FROM GATE. AFTER PUSHBACK (XX28Z) ON AUG/XA/98; FLT XXX; DEN-OKC; WHEN THE CAPT SET THE PARKING BRAKE TO BEGIN THE START SEQUENCE; HE NOTED THE BRAKE ACCUMULATOR PRESSURE INDICATOR DROPPED TO 2300 PSI. WE (CREW) CONFERRED WITH ACR MAINT AND TALKED WITH ACR MAINT INDIVIDUAL THERE ABOUT PROB. THEIR ADVICE WAS TO RETURN (VIA TUG) TO GATE; HAVE ACFT CHOCKED; TURN OFF 'HYD B' PUMPS; AND PUMP BRAKES TO DEPLETE RESIDUAL PRESSURE AND THEN CHK INDICATOR FOR RESIDUAL PRESSURE. (WE ACCOMPLISHED THESE ITEMS.) IF INDICATOR REMAINED ABOVE 1000 PSI; THEN MAINT STATED THAT ACCUMULATOR PRESSURE WAS NORMAL; AND 'B' PUMPS COULD BE TURNED BACK ON. IF INDICATOR INDICATED NORMAL RANGE (GREATER THAN OR EQUAL TO 3000 PSI) WITH 'B' PUMP ON; THEN NOTHING WAS WRONG AND WE COULD CONTINUE. MAINT ALSO WANTED TO TALK TO GATE MECH AND EXPLAIN SIT ON PHONE. CAPT PERFORMED PRESCRIBED ACTIONS -- PRESSURE INDICATED 975 PSI UNTIL 'B' PUMPS WERE TURNED BACK ON; THEN 3100 PSI. GATE MECH RETURNED FROM KIOSK AND CLRED US TO PUSHBACK AGAIN. (MAINT HAD TERMINATED RADIO PATCH.) MADE ENTRY IN LOGBOOK ADDRESSING PROB AND 'OK TO CONTINUE PER MAINT CTLR' WITH CAPT'S NAME; AND CONTINUED TRIP UNEVENTFULLY. UPON RETURN TO DEN (AFTER OKC LEG); MECHS INFORMED CAPT WE MAY HAVE NEEDED DEFERRAL ON THE ITEM. IN THE FUTURE; A SECOND CALL TO MAINT CTLR AFTER CORRECTIVE ACTIONS WERE TAKEN WOULD CONFIRM STATUS; ALTHOUGH FIRST CONTACT GAVE DEFINITE IMPRESSION WE WOULD BE GOOD TO CONTINUE. ALSO; COULD HAVE HAD MAINT TECHNICIANS PERFORM TROUBLESHOOTING VICE CREW. ELIMINATES ONE POTENTIAL COM PROB. SUPPLEMENTAL INFO FROM ACN 410926: MAINT WAS CONTACTED; AND THE CREW WAS GIVEN A PROC TO HELP MAINT RESOLVE THE PROB. THE PURPOSE OF THE PROC WAS TO CHK SYS RELIABILITY FOR LEAKS AND ACCUMULATOR PRECHARGE. NOTHING ABNORMAL WAS FOUND. IN THE PROCESS OF TROUBLESHOOTING THE PROB; THE BRAKE PRESSURE INDICATOR RETURNED TO NORMAL. ALL THIS INFO WAS GIVEN TO MAINT WHO WAS IN CONTACT WITH LCL MAINT. COM WITH LINE MAINT PROVIDED NO INDICATION TO PRECLUDE A CONTINUATION OF THE FLT; AND THAT ANY FURTHER ACTION WAS REQUIRED. THE FLT DEPARTED. DOCUMENTATION BY MAINT WAS NOT COMPLETED. IT IS FELT THAT THE COM LINK BTWN ACFT MAINT AND LCL LINE MAINT IN THIS CASE WAS WEAK. INFO NEEDED BY THE CREW WAS NOT PROVIDED. THE CREW BELIEVED THE FLT COULD DEPART SINCE LCL MAINT CLRED THE FLT FOR PUSHBACK. SUPPLEMENTAL INFO FROM ACN 411297: IN HINDSIGHT; WE SHOULD HAVE CALLED MAINT AGAIN TO CONFIRM WE WERE CLRED TO DISPATCH. ANOTHER OPTION WOULD HAVE BEEN TO INSIST ON A NEW MAINT RELEASE FROM THE MECH. A BREAKDOWN IN COM OCCURRED BTWN THE ACFT CREW; MAINT; AND THE LCL MECH PUSHING US BACK. ASSUME NOTHING!