i lost my power steering and hydro boost and we replaced the pump and hydro it now steers good and hydro boost seems to work but as you drive the brake pedal will tighten up and the front wheels will tighten up and if you keep driving they will lock up we also replaced calipers and front rubber hoses its a 98 5.9 5spd dually 4wd any help would be appreciated thanks

 

Mine did this and it wound up being a bad master cylinder.