My F4i,, When on the rear brake,,,,, ok,, when testing my rear brakes to see just how fast I can stop with out locking it up, I noticed a clinging sound,,, Almost sounds like the rear end is moving forward????? I can't really tell when I'm on the bike cause of the obvious, I'm on the damn bike,,,, I did lift the rear end up and tried to pull and push on the wheel to see if I could move it, however, no luck,,, Is it a safety feature or what?? Hit me back please! TY I'd rather know before something falls off, LOL

 

is the caliper bolted down correctly? put the bike on a stand and try and found out where the sound is coming from.

 

It's probably just the chain taking clack from the force of braking.

 

Check your S/A mounting bolts, axle, and chain adjuster. Check the slack in the chain. It's likely out of spec.

 

chain