CESSNA 414 PLT LOST CTL OF THE ACFT WHEN PWRING UP THE L ENG TO PIVOT TOWARD THE RWY.

Narrative

ON THE MORNING OF FEB/XA/01; MYSELF AND 5 OTHERS TAXIED FOR DEP FROM OFP TO LNS. AT THE END OF THE TXWY; I PWRED THE L ENG TO APPROX 2000 RPM TO PIVOT THE C414 90 DEGS TO THE RWY. AT THAT POINT I DISCOVERED THE R BRAKE HAD FAILED AFTER I TESTED THEM WHEN WE LEFT THE CHOCKS. I KEPT THE PWR UP TO TRY TO COMPLETE THE TURN; BUT IT WOULD NOT. THIS MOMENTUM CARRIED THE PLANE APPROX 20 FT INTO A DITCH; COLLAPSING THE NOSE GEAR. THERE WERE NO INJURIES NOTED BY ANYONE. IT APPEARS THAT A SEAL ON THE MASTER CYLINDER FAILED BEHIND THE PLT'S RUDDER PEDALS. FLUID WAS FOUND INSIDE THE FUSELAGE AFTER THE INCIDENT. THERE WAS NO FLUID PRESENT ON THE GND WHERE THE PLANE HAD BEEN PARKED OVERNIGHT. I PERCEIVED THAT USING THE ONE GOOD BRAKE WOULD HAVE CARRIED THE C414 OFF THE L SIDE OF THE TXWY AND INTO A CONCRETE CULVERT WHICH IS WHY I ELECTED TO SHUT DOWN AND TAXI OFF THE TXWY INTO A GRASSY FIELD. THE METHOD THAT HAD BEEN USED TO CUT THE FIELD SHADOWED THE DITCH FROM MY VIEW OR I WOULD HAVE TAKEN DIFFERENT ACTIONS.