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i just had an entire new brake system installed on my truck. sometimes, when i press the brakes fairly hard, the front right disk brake squeeks really loud, and the truck pulls sharply to the right (like if i let go of the steering wheel, i would go in the ditch)
The left caliper is hanging up if the truck pulls to the right when braking. I would also replace the rubber brake line.
I would jack the front up and press the brakes and see if both wheels lock up and then release the brake pedal and see if the wheels still spin freely. I know this is not the same as a full load moving down the road but its a place to start.
Before you go replacing calipers, I would take that side apart. I've seen the brake hose get twisted and cause the pads to hang up, and I've seen poor lubrication jobs cause binding of the pads as well. Take it apart and lubricate the slide pins really good. Also get a can of brake cleaner and spray everything out good before you put it back together. If they didn't replace the slide pins (I've seen shops pull that stunt, too) that could also cause the problem.
In addition to what they have said, try to bleed the brake fluid. Bleed the the whole fluid until a clean fluid comes out on each brake side. Use a large brake fluid when doing this.
Don't forget to play in the steering, wheels. So, you have to raise the front with tires on and check for play. You need to lower it down and raise up the front again and remove tires and check for any play for tie-rod, ball joint, etc.