u/barelyusethisapp2

Got this 88 about a year ago, been fixing it up piece by piece. Currently rebuilding the brake system and I’ve run into some issues with my left piston. The parking brake lever is pushing the caliper out but wont pull it back in like it does the other side. I’m only able to screw the piston back in when it’s fully removed, after that it will only push the piston out and refuses to be pushed back even with my piston tool. Can’t find much about these so I’ve just been winging it so far. I know it’s pretty common for the e brake mech to seize up and need cleaning but when I popped the piston out it all looked pretty clean. I noticed the left side (the side I’m having issues with) has a different size nut as well as a washer pinching between it and the lever. The levers also bent up a bit around the point where it’s supposed to be making contact with the caliper. I’m not sure whether or not that could be causing it but if anyone can help me diagnose before I start ordering some $80 seals I’d appreciate it. Wouldn’t let me post any vids here but I did my best to take some pics comparing the two. Don’t wanna take apart the right side unless I really have to.

This maybe somewhat of a shot in the dark but this kid came by while I was working on my car and asked if I can help replace this bearing for him. Can anyone help me find the correct part number? He said he couldn’t bring his bike so I couldn’t get any pics but he said it’s a blue mongoose.