84 4dr dually brakes

My dually has started acting up recently.When I put the brakes on it pulls to the right and then I let off and the left front hangs up.It doesn't do it every time but often.I am thinking I need to replace the calipers but the brake system doesn't have the normal booster like I am used to.It looks to me like the power steering and brakes are tied in together.Different deal for me.Gotta get it fixed though please voice opinions,Thanks.

You can replace the calipers the same way that you would on normal brake setup. Your truck has the hydroboost setup...which makes the power steering system a lot "stronger", by running off of the brake booster.