Have a 1996 chevy truck and all reddy changed the calipers for pulling to the right .?

Replace both front brake hoses and copper washers and bled system

After a test drive is one rotor hotter than the other? If so it could be a bad brake hose on the hot one. The hoses can fail internally and when they do they act like a check valve. They will let the 1000's of psi of braking pressure through but they wont let the fluid return back so some pressure remains in the caliper and it drags. Hot rotor does not work as good as a cool one so that is where the pull comes from.

If the ABS cycles with air in the system either from the system operating or just turning on the key you may now have air in the ABS unit. With air in the unit every time you turn it on it does a quick self test which cycles the valves and may be pushing air into one or more of your lines. You get air in one line that makes the brake on that wheel soft. Will also make the other brakes work harder so they will tend to run warm which decreases their efficiency. Only way to get the air out of the ABS unit is with a scan tool to put it into bleed mode and follow the specific process.

Sure it isn't an alignment issue??? When you press on the brakes & the front end dips, it can pull in the direction if the alignment is out of whack. I had that same problem on an H3 that had that same problem. Alignment was out

Hi, Well this does seem familiar to me but I wonder if you had a mechanic check out your front end. It is possible you have a bad outer and inner tie rods. Also look at your tires and see if the threads are not damaged. Good Luck!

I suspect something wacky in the alignment. Sounds like something is worn and introducing slack into the steering. Ball joints or A-arm bushings being the most likely candidates.