Oddball thought – The tires are inflated to the same pressure on each side, right? Someone checked?
My dad was sold a set of new tires once and had problems with the car pulling (although not necessarily related to braking, it could be easier to be aware of it when braking). He took it back and the service center took the tires off, rebalanced them, checked alignment, checked brakes, and then held a conference of several mechanics trying to guess what the issue was.
They finally announced that it was a German car (VW Rabbit) and could only be properly aligned in Germany and there was nothing they could do.
My Dad was furious, but he took out his pocket tire pressure gauge right there in front of the mechanics and measured each front tire.
There was 29 pounds difference in tire pressure between left and right, on the brand-new tires they’d just installed.
So now one of the first things I always check whenever there’s a “pulling” problem is the tire pressure.
If you have verified that it’s good, please disregard.