[Z06] brakes pulling





I've bled the brakes again, and wondering if the left caliper has pistons not doing the job.
what is the best way to trouble shoot this?
the other thing that is really strange is the cars alignment didn't hold
it pulled hard right, and then the steering wheel was off to the right. I had just had it aligned 2 weeks prior, and sure enough, it was off again.
thinking maybe it's not the brakes, but something bad in the suspension.
I've done a basic check, car only has 28k miles on it. bushings look ok on the control arms and everything seems tight.
any advice is appreciated!





tire pressure are OK. I'm going to pull the wheels and check that all the pistons in the calipers are coming out.
might have a stickey caliper on the drivers side.
thanks for the tips!!












