the front left brake on my 2007 Pontiac G6 GT keeps locking up, I just changed my caliper and pads and it is still doing it. anyone know what may be causing it?

You might have moisture in the fluid.

Brake line may be collapsed, or you got a bad caliper. Also, always change the brake hardware when doing a brake job.

My G6 is doing the same thing and pads, rotors, calipers are new. Just got home and it is locked up again and was smoking when I got out? Going to replace brake line now to see if that helps and tomorrow I will. E at the dealership trading it. I am tired of the issues.

I had a bad ABS unit - the brake would lock - if you crack the bleeder it would release (not the caliper) and pumped all new fluid through so not lines - but was still locking - new ABS unit anywhere form 200-800 depends on what you need - i got a used one and crossed my fingers