FLT IS CANCELED AND FERRIED FOR ACR MAINT INSPECTION AFTER AN ACR MAINT INSPECTOR QUESTIONS THE CONDITION OF BRAKE PADS ON AN SF340 SCHEDULED FOR A REVENUE FLT AT CAK.

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I AM WRITING IN RESPONSE TO A REQUEST FOR INFO CONCERNING FLT XY THAT I WAS SCHEDULED TO OPERATE ON OCT/THU/04. I WAS FLYING WITH FO X. WE LANDED IN AKRON AND WERE SCHEDULED TO DEPART FOR ZZZ1 SHORTLY THEREAFTER. BEFORE I COULD COMMENCE MY POSTFLT; AN FAA MAINT INSPECTOR BOARDED THE ACFT AND SAID THAT HE WAS GOING TO INSPECT THE ACFT. AS I WAS ACCOMPLISHING MY POSTFLT; THE INSPECTOR TOLD ME THAT THE L BRAKE PAD APPEARED TO BE WORN. I PROCEEDED TO VISUALLY INSPECT THE BRAKE PAD; AND THEN I WENT TO THE COCKPIT TO FIND THE WRITTEN GUIDANCE THAT STATES THAT THE BRAKE PAD CAN BE CHKED BY RUNNING A CREDIT CARD OR A FINGERNAIL ACROSS THE PAD; AND IF IT TOUCHES THE BRAKE PAD PIN; THE BRAKE PAD IS STILL GOOD. I COULD NOT FIND THIS GUIDANCE IN THE POM; ALTHOUGH MY FO REMEMBERED IT AS WELL. I THEN PROCEEDED BACK OUTSIDE THE ACFT; ALONG WITH THE MAINT INSPECTOR. I RAN MY FINGERNAIL ACROSS THE PAD; AND USED A CREDIT CARD. BOTH TIMES; I WAS ABLE TO FEEL THE BRAKE PAD PIN. I CONTACTED MAINT CTL TO ADVISE THEM OF THE SIT. BECAUSE THE FAA MAINT INSPECTOR SEEMED TO THINK THE BRAKE NEEDED A MAINT INSPECTION; WE CONCURRED THAT THE BRAKE PAD WOULD BE WRITTEN UP. I THEN WROTE UP THE BRAKE PAD. CONTRACT MAINT CAME TO THE ACFT AND INSPECTED THE BRAKE. WE FERRIED THE ACFT TO ZZZ1 WITHOUT INCIDENT.