Have replaced left brake but after a couple of days the brake pad locks up, need to know why?

check your rubber hose to caliper. If it is kinked or anything doesn't let the brake fluid return the flow it will stay depressed and wear out and or lock up your brakes

I have a 2011 equinox both back breaks seem to cwase up when they get warm. I had both calipers changed out in back drive for 30 minutes and they locked right back up. I am getting a service stability trak on my dash. I am now having the break master cylinder replaced any ideas what the issue may be. It's both back breaks.