auxilliary

2010 Fe450 Little help? Can anyone tell me what this is/does? Fig 40 on fiche? its a 10 or 12mm hex head bolt on the rotor side of the axle under the axle nut. When I tighten it seems to ratchet or click? I just finished replacing the brake pads and installed a new rotor and now the brakes seem...

I got a 96 FE 400 a few weeks ago. The previous owner put a few goodies on it. However, one was an aluminum tank from Eric's in Pasadena, it is behind the rear shock with a tube that is connected to the stator cover? Is anybody familiar with this tank and its purpose...it sounds like it might...