BE190 CREW HAD A TKOF THAT FELT ABNORMAL; TO THE POINT THAT THEY RETURNED TO THE DEP STATION.

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THE CAPT AND I ARRIVED AT THE ACFT TO BEGIN OUR DAY. WE COMPLETED THE APPROPRIATE CHKLISTS AND I PERFORMED THE EXTERIOR PREFLT. AFTER THE PAX WERE BOARDED; WE STARTED THE ACFT AND TAXIED OUT. THE CAPT XFERRED THE CTLS TO ME. WE WERE INSTRUCTED TO TAXI INTO POS AND HOLD AND WERE CLRED FOR TKOF SHORTLY THEREAFTER. DURING THE TKOF ROLL; 'V1 ROTATE' WAS CALLED AND I BEGAN TO ROTATE. IT SEEMED TO BE TAKING MUCH MORE BACK PRESSURE THAN NORMAL TO ROTATE AND THE ACFT FELT LIKE IT 'POPPED' OFF THE GND. DURING CLBOUT; WE DISCUSSED THE ABNORMAL ROTATION AND WE DECIDED TO RETURN TO MLI FOR A PRECAUTIONARY LNDG. WE REQUESTED AND RECEIVED CLRNC TO LAND. DURING THE DOWNWIND; I WAS ASKED WHETHER OR NOT THE CTLS FELT NORMAL. I STATED THEY FELT NORMAL. WE FOLLOWED STANDARD PROCS; RAN OUR CHKLISTS; AND MADE A NORMAL APCH AND LNDG. SHORTLY AFTER TOUCHDOWN; WE FELT THE ACFT BEGIN TO DECELERATE. SOON AFTERWARD; WE FELT AND HEARD THE ACFT SHAKE AND VIBRATE; WHICH WE LATER FOUND OUT WAS CAUSED BY ALL 4 MAIN TIRES DEFLATING. DIRECTIONAL CTL WAS MAINTAINED THROUGHOUT THE LNDG ROLL AND THE ACFT CAME TO A STOP ABOUT 1.5 FT FROM THE CTRLINE. TWR ADVISED US THAT THERE WAS SOME SMOKE AND ASKED IF WE NEEDED ASSISTANCE. WE DID NOT EXECUTE AN EMER EVAC OF THE ACFT AND THERE WERE NO INJURIES TO PAX OR CREW. AFTER COMPLETING CHKLISTS; SHUTTING DOWN; AND SECURING THE ACFT; WE DEPLANED THE PAX AND HAD THEM XPORTED TO THE TERMINAL. MAINT PERSONNEL THEORIZED THAT THE MOST LIKELY CAUSE OF THIS SIT WAS THAT THE PARKING BRAKE HAD NOT FULLY RELEASED WHEN WE RELEASED IT TO BEGIN TAXIING; EVEN THOUGH THE RELEASE HANDLE APPEARED TO BE FULLY RETRACTED AND EVEN THOUGH THE ACFT TAXIED AND HANDLED NORMALLY DURING OUR TAXI OUT AND TKOF. AT NO TIME DURING TAXI; TKOF; FLT; OR LNDG DID EITHER OF US SET THE PARKING BRAKE AND FORGET TO RELEASE IT.