I recently had a hose blow out on Ranger and.

I recently had a hose blow out on Ranger and water got in the power steering pump. Of course I didn't know, so after replacing the hose, I took it for a drive. As soon as the pump started screaming at me, I returned to the house. I drained the dark, frothy fluid and, with a bucket under the detached line, flushed a gallon of power steering fluid through and out of the system. I topped off the pump with clean PS fluid and it ran fine for a week. 2 things.I read online that the PS pump uses Mercon Auto Tranny Fluid. Should I flush it again and refill with ATF? Also, I have no brakes. I believe all Ford's use the hydro-boost system. Could the fuild change effect the braking system?