Motorcycle Repair: rear brake moan 2008 drz400sm, drz400sm, new bike

Question
hi, so Ive got a brand new drz400sm -two months old.  very happy w it. but i
have a nasty brake moan that wont go away. The rotor is clean and its been
some time since I got in the water and rocks, I thought I just had some
particles there but it keeps coming back.. Any ideas? it really moans at the
end of the braking period and is a deep vibration not a metal grind...??
thanks for any info I cant find anything on the web and I hate going to the
dealer.

Answer
Service manuals often suggest the caliper bolts get re-tightened on a new bike after brake in. That's my only guess right now. If its really a problem you may need to remove the pads and inspect them. Low freq vibes can also be caused by an uneven rotor but on a new bike?