hello ive just bought the mercedes 190 2.3 16 cosworth,ive been having problems with the power steering,so i thought i look into it and found out the previous guy topped it up with brake fluid so i flushed the resavoir and put in power steering fluid but still its a bit stiff and sumtimes intermittently starts working on & off could the brake fluid damage any parts and what else can i do as its making a whining noise now everytime i try to turn the wheel.