PLTS OF A PIPER PA23 INADVERTENTLY TOOK OFF ON THE TXWY AT A NON TWR ARPT DUE THE HASTE OF THE PLT OWNER IN DEPARTING THE ARPT.

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I WAS OFFERED A CHANCE TO GET SOME CHEAP MULTI-TIME IN AN APACHE. THE OWNER OFFERED TO FLY WITH ME AND 'SHOW ME THE ROPES;' AND THEN I WOULD GET A FORMAL CHK-OUT FROM AN INSTRUCTOR. THE OWNER HAD BUSINESS AT F18; SO WE DEPARTED GKY (ARLINGTON; TX) FOR F18 (CLEBURN; TX). HE WOULD FLY THERE AND I WOULD FLY BACK. THE TRIP OVER WAS UNEVENTFUL; BUT THE TRIP BACK STARTED BADLY. THE OWNER WAS IN A HURRY; AND AS HE WAS ON THE L SIDE AND THERE WERE NO BRAKES ON THE R SIDE; HE TOOK THE TAXI DUTIES. HE ELECTED TO DO AN INTXN TKOF; SOMETHING I NEVER DO. WE DID HAVE SUFFICIENT RWY. I WAS RUNNING THE CHKLIST; AND THE OWNER WANTED TO GO. SO HE TAXIED ON THE RWY SURFACE AND RAN UP PWR AND RELEASED BRAKES; WHILE I WAS STILL RUNNING THE CHKLIST. HE SAID 'YOUR AIRPLANE' AND I TOOK THE CTLS. A GLANCE OUTSIDE AFTER PUTTING THE CHKLIST DOWN AND I REALIZED WE WERE TAKING OFF ON THE MIDDLE TXWY. I PULLED BACK THE PWR AND CALLED FOR AN ABORT. THE OWNER PUSHED THE THROTTLES FORWARD AND SAID GO. I HAD NO BRAKES ON MY SIDE AND WE WERE PASSING THROUGH 60 MPH. I HAD TO COMPLETE THE TKOF. I WAS VERY UPSET; AND CALLED ON THE PHONE TO APOLOGIZE AFTER THE FLT. AT THIS TIME I DO NOT PLAN TO FLY WITH THIS GENTLEMAN AGAIN. RUSHING PRE-TKOF CHKLIST AND PROCS IS DANGEROUS.