Seams like my sealed rear brake on my '05 BF750 has gotten quite a bit weaker than when it was new (about a year ago). Now I would expect some possible reduction, but it seams like it's about 50% weaker and that seams like a lot.
Yes, it is adjusted correctly per the manual, yes I've changed the fluid twice since new and well under the service intervals using the kawi fluid, no I'm not running larger than stock tires nor have I changed tires and wheels lately, the cable(s) has also been kept well lubed.
I'm also wondering if anyone has had to rebuild theirs (I'm assuming that it will at some point have to replace the wearing material) and how that went...also how much did it set you back in parts?
Any thoughts and/or experiences?

 

mine seems to be way weaker also after 2 years.

 

I noticed my rear brake got weaker in the first 600-1000km, but it hasn't changed since and now there is 23000km on it I never took it appart. I wouldn't say mine was 50% weaker maybe 20%.

 

I know you said that you changed the oil twice, but I noticed when I changed mine the brake got much better. Maybe it do again.