Front passenger brake lock

[WBR1992]

Hello, I have a 2016 fiesta ST. The vehicle had an issue where the front right tire was not getting any pressure or fluid. I changed the master cylinder and a hose and it did not give me any results so I ended up replacing the ABS pump. After I replaced the ABS pump, the same tire wouldn't release pressure anymore. The ABS pump is new. I replaced the slide pins because I had read that that could be it. I have seen a few posts on here where they speak about brake locking and how the pedal can be the issue which I did try to pull on the pedal whenever they get locked up and it did work but I can't find anything where they say what was the actual reasoning. The brakes were locking and what helped the pedal situation. I'm looking for advice or if you could just put links to the other post since I know a lot of people have talked about the same thing. Thanks in advance