A B737-700 WAS DISPATCHED WITH A LOGBOOK WRITE-UP NOT CLRED OR DEFERRED. THE LOGBOOK ITEM WAS #2 BRAKE WORN. THE BRAKE WAS ACTUALLY REPLACED PRIOR TO FLT BUT NOT SIGNED OFF.

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I DEPARTED ZZZ WITH AN OPEN WRITE-UP IN THE LOGBOOK. THE ACFT HAD COME FROM THE HANGAR THAT MORNING. A MECH HAD ENTERED A DISCREPANCY FOR #2 BRAKE WORN. THE BOTTOM OF THE LOGBOOK PAGE WAS COMPLETED FOR POS #2; TAG NO X; PART NUMBER OFF XXY; SERIAL NUMBER OFF Y; PART NUMBER YYY; SERIAL NUMBER W; AND OIL QUANTITY ADDED FOR BOTH ENGS BY THE MECH. HOWEVER; THE ACTION TAKEN BLOCK HAD NOT BEEN SIGNED OFF. WHEN LOOKING AT THE LOGBOOK I SAW THE ABOVE ITEMS BELOW THE TYPE DEFERRAL BLOCK AND MUST HAVE CONSIDERED THE MAINT ACTION COMPLETE. THE MATTER WAS BROUGHT TO MY ATTN BY THE ONCOMING CAPT WHEN I HANDED HIM THE ACFT IN ZZZ1 AT THE COMPLETION OF MY DAY. I CALLED A ZZZ1 MECH TO COME AND ASSIST ME WITH THE LOGBOOK WRITE UP. HE CALLED ACR LINE MAINT WHO INFORMED HIM THAT THE ACFT BRAKE REPAIR HAD BEEN DONE AT THE HANGAR. HE THEN CALLED THE ZZZ HANGAR AND WAS INFORMED THAT (INCREDIBLY!) THEY ALREADY KNEW THAT AN OPEN WRITE-UP EXISTED; AND THAT SINCE THE ACFT WAS GOING TO TERMINATE IN ZZZ2 THAT EVENING; THEY WERE GOING TO FAX THE PAGE TO ZZZ2 AND HAVE THEM MAKE AN ENTRY STATING THAT THE BRAKE HAD BEEN REPAIRED. THERE WAS NO CONSIDERATION OF INFORMING THE MULTIPLE CREWS WHO WERE GOING TO FLY THE ACFT THROUGHOUT THE DAY; NOR DID THE HANGAR PERSONNEL INFORM DISPATCH OR MAINT CTL. MINE WAS AN ERROR OF OMISSION; THEIRS WERE ERRORS OF OMISSION AND COMMISSION. WHEN WE MAKE A HONEST MISTAKE; WE MUST BE PROACTIVE; ADMIT OUR MISTAKES; AND CORRECT THEM AT THE SOONEST POSSIBLE MOMENT. ON MY PART; I WAS TIRED FROM NOT GETTING A GOOD NIGHT'S SLEEP; WHICH PROBABLY LED TO ME MISSING THE INCOMPLETE DOCUMENTATION. THIS IS NOT THE FIRST TIME THAT I HAVE DISCOVERED INCOMPLETE DOCUMENTATION WITH ACFT COMING FROM THE HANGAR. IT IS JUST THE FIRST TIME I DID NOT CATCH THE ERROR BEFORE DEP.