Brake issues

[Duke0594]

I'm having trouble with the brakes on my 97 boxster. It needed new brake pads. No problem, or so I thought. Replaced the pads on all for corners. Took the car it for a test drive. Everything seemed ok until I noticed it was slowly decreasing speed. Noticed that the brake pedal was getting hard to push down. The end result was stranded a couple miles from home with smoke coming from the brakes. They were heating up slowly and then pretty much locked up the front completely and the back brakes were very hot as well just not smoking like the front. After the car sat for several hours and the brakes cooled off I was able to get it home. Took it to a mechanic and after a new master cylinder and brake booster I am still having the same issue. Mechanic says he doesn't think it's the calipers. I disagree with him. I'm guessing that when pressing in the pistons to get the old pads off something went wrong with the calipers. I checked the brake lines and I dont see any damage to them. Anyone agree to go with the calipers or am I missing something else? Thanks in advance.

[Anker]

Are you able to do some DIYing yourself?

If you are, try to push the brake pads to compress the caliper pistons on every caliper. You can use a large screw driver. They should all push in and leave a significant gap, like 1mm, to the disk. If one or more of them are noticeably harder, or not able to, to push to open a gap it is sticking.

Are you sure you used the right pads?

[Duke0594]

As far as the pads go I went to the auto parts store and told them what year make and model. When I took them off and held them side by side they looked the same.

Yes I can do what you are suggesting. I will try that next and see what happens. Thanks for the suggestion