GM that pulls to left when braking.

My GM has a very slight pull to the right with driving, but when you put on the brakes, it wants to pull to the left. I have had front drivers caliper repaired, as they thought it was draging, as well as a allingment. Nothing has helped.
any ideas?

I would probably have the right caliper repaired also ,then you know that it is not binding.

Pull to right while driving + pull to left while braking = right caliper is hanging and not working.