Front brakes have been locking up

If the caliper is good but not releasing, make sure the slides are loose, the piston is easy to depress, and if they all look good, I would try replacing the rubber brake hose to that caliper. I have seen them deteriate to a point where they allow pressure to be applied but wount let the brake fluid return to release the caliper. Hit the brakes and if it doesn't release, open the bleeder to see if it releases then. If it does, chances are the hose is the problem.

That is not much information to go on. What are the symptoms? Do you have to turn fully to the side or just part way? What do you do to get the brakes to let go?

You did not list if it is a four wheel drive. If it is, a common problem that shows up when turning is a binding outer front universal joint. That will stop some vehicles and it will force the steering wheel back to center.

Obviously tires that are too big could rub on the inner fenders, but you would hear that. Also, simply straightening the steering wheel would solve that.

The next thing is to determine if this is a mechanical problem or a hydraulic problem, meaning trapped brake fluid. Typically trapped brake fluid only occurs after the pedal was pressed, then the brakes stay partially-applied, they get hot, the trapped fluid heats up and expands, and that applies the brakes harder. To locate the restriction, which is usually caused by a rubber flex hose, you have to stop on a slight incline, shift to neutral, place a block about a foot downhill of a tire, (so you don't look funny running after the vehicle), then you open the system at various places to see where the fluid is being trapped. Caliper bleeder screws and the steel lines at the master cylinder are the easier places to do that.

Mechanical problems that let the brakes lock are usually caused by rear drum brakes. A parking brake cable rusted tight in the partially-applied position will cause those shoes to grab the drum and self-apply. Backing up will let them release, but that doesn't have anything to do with turning the steering wheel.

Some vehicles have "bump stops" which are mechanical blocks that limit how far the steering system can be turned. If those have rusted off or were removed, over-turning can cause binding.

With all the brakes locking up the master cylinder could be going bad and sticking. When it happens try releasing the pressure from the master cylinder by loosing the line comming out as one would bleed the cylinder and see if the pressure releases. If it does you need a master cylinder.