Squirrelly braking.

Here is my problem that has been getting worse and worse lately. As I apply normal brakes, it will pull to one side, usually right, but sometimes left and as soon as I let up, it stops. Usual steering correction will compensate enough. Now heavy braking is when she starts dancing left and right. No chance to correct with steering wheel bc it's hard and fasteotwith the left and right. Now, all new steering components from steering box t outer tie rod ends. New wheels and tires, brakes aren't new but plenty of pad left and no major grooves cut in the rotors. I haven't been able to check the brake lines for collapsing but the lines don't look bad. Any ideas at all??? Could bad control arm bushings do this? Driving she stays true all day, this is only when I brake...