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If you want to to clean motorcycle disc brakes & caliper non-friction surfaces, use brake cleaner or an alcohol solvent as the brake pads can leave residue and grind them uneven. https://www.bikeshala.com/blog/how-to-clean-motorcycle-disc-brakes-caliper-with-degreasing-cleaner/
The front wheels are 70 percent more effective than rear wheels in controlling bike speed. It is not that disc brakes have all the advantages over drum brakes https://www.bikeshala.com/blog/disc-brake-vs-drum-brake-for-bikes-scooter/