how does disc brake works for motorcycles?
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Same way they work for any other vehicle that's equipped with disc brakes.
When the brake lever is squeezed/pressed brake fluid pushes a piston up against the brake pads. The brake pads are in turn pressed against the disc. Once the lever/pedal is released the pressure is relieved from the piston in turn releasing the disc to spin freely. Hope this helps.
Disc brakes work by a master cylinder being on the handle bar and a brake lever when you pull the brake leaver, brake fluid is forced down to a line which goes into the caliper which pushes a piston out which than pushes the brake pad against the disc. With disc brakes they will need to bleed as if you air gets into the system they don't work very well as the fluid cannot compress very well and the braking power will be reduced. It's the same with the rear disc brakes they work on the same principle as the front. Hope I helped you :)