Motorcycle brakes,
just like other parts on motorcycles, can become dirty and covered with oil, grease and other residue. However, for any kind of decent performance, motorcycle brakes must be very clean. So, it is important to quickly and effectively clean these pieces of equipment without damaging them.
Pull the motorcycle to an open, accessible area (preferably a lawn), and place the motorcycle on a jack stand or center stand. If you do not own one of these stands, try placing the bike on a large block or similar device.
Use a flat-head screwdriver to pry apart the brake pads in the brake assembly. Dip a rag in a bucket of hot, soapy water and use it to begin scrubbing the brake disc. The disc is easily accessible just to the side of the tire, and you can access the disc area within the brake pads by turning the wheel.
Slide the rag between the brake pads. Make sure to get them as clean as possible.
Use a sponge with a scrub side to scrub grime and grease off the surface of the brake disc. Again, spin the tire to access the portion of the disc that is between the brake pads and within the assembly.
Hose the entire braking assembly. It is important that no soapy residue is left on any surfaces of the brake, as it will cause slipping.
Leave the brake pads spread apart for several hours so they can dry.
Grease n Gasoline 