I was cutting a yard today with my ZTR. The yard was on a slope with a off angle. My ZTR went out of control. NO STEERING or BRAKING. The angle of slope dragged the mower in the direction which I was trying to steer away from. I picked up speed and crashed thru a chain link fence. I am reconsidering this equipment. All my work is on some kind of slope. This thing works great on level but is not safe on hills. It is a 48" Yazoo/Kees. Is there any suggestions.