Jp's camaro

I'm having a weird issue where the brakes act like they have to much pressure sometimes then to little other times. It seems like its gotten a bit worse lately, yesterday when I was going to stop the pedal was going a good bit but wasn't giving much stopping power until I about put it in the floor then the front locked. The pedal travels farther then I think it should. The pedal is firm but I have to get into it a good bit for the brakes to start working decent. Any ideas ?

Jp's camaro

Welp think i found the problem. Rear wheel cylinder is leaking