Sorry for bumping a really old thread, but I just wanted to say thank you to everyone in here. After over a year trying to fix my 2004 Troy Bilt Super Bronco and spending I don't even know how much money on it (love this mower, wasn't wanting to give it up no matter what), I was finally able to get the brakes to start working again.
Turns out, the belt I eyeballed at the store was a little too short. Replaced the belt with one I ordered online after finally tracking down exactly what type of mower I had (thanks to a few other websites and a guy on JustAnswer - I was way off, I kept thinking it was a Troy Bilt Bronco between 2008-2010) to figure out the part number, and with the information here, my mower finally works!
I love this mower and was almost ready to completely give up despite not wanting to, now she's fixed and ready to go. No more dealing with my 2018 Craftsman T1200 (it's an alright mower but the old Troy Bilt runs circles around it in every way). Cleaned her off and at least with all the work I put in before I found this forum with the real fix, I now have brand new grease in my freshly cleaned transaxle, new brake pucks/pads, new rotor (although the pads/rotor took a hell of a beating during testing before finding this thread, so those are likely going to be replaced again soon lol), and she's all tuned up.
Thanks x1,000 guys! Extremely happy my favorite mower is back in service.
Edit: also holding the mower up using a strap and a tree works amazing, thanks for that as well, hated pulling out the jack stands and jack every time I tried to fix it. So much easier to just lift it up and hook it, much more visibility and room to work as well. I didn't like when I'd rolled it on its side in the past and it was hard to lift back up without slamming it down the last couple feet, and the strap/tree method solves so many issues I had with putting it on its side (or back, which it didn't want to stay due to a bagger attachment thing that's bolted up to it even with bagger removed.)