I have a few high milage rollerbrakes of similar models. In my experience there isn't much you can do once they turns spongy. I have tried completely cleaning them, and greasing them with new rollerbrake grease, but it didn't help. However, they will still stop you, but not as confidently as they once would.
When getting higher end rollerbrakes it isnt only the heatsink that changes size. The higher end models like the 6000 have V shaped braketracks and V shaped brake shoes, which gives them better performance than the lower-end models with flat tracks and shoes.
Last edited by Pyramiden; 11-07-20 at 05:37 AM.