2015 CBR650F non-abs. Just got the bike a few weeks ago. 5300 miles on it. Rear brake seems really weak and has a weird feel to it. Not sure since I'm new to the bike but it just doesn't seem right to me. 1/4 pedal does about nothing, 1/2 pedal start to get some slowing, then 3/4 pedal the pedal has a sort of notchy feel to it, almost like something is binding / sticking. Hard to get full pedal as the feeling just gets goofy so I let off. When backing the bike out of garage, noticed a creaky noise from the back. Went to take apart the brake and found the frame slider / rear spool hitting the caliper and I think it was impeding its movement. Took the slider off to check the brake but the feel is still the same. No more noise though. Took pads out, scuffed surface, cleaned and lubed slider pins and pads / shims. Still same feel. Have not done anything with the pedal yet. Anyone else felt same thing? Any input? Things to check? Thanks in advance!