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Get the whole range of mini bike master cylinders, calipers, rotors, and hubs, and everything else related to the mini bike braking unit from OMB Warehouse. Every item is sourced from leading brands and is good as OEM replacement parts. Before ordering, ensure that you have the right Part no. and check with the specifications for the particular make and model of your mini bike. Mini bikes master cylinders contain the brake fluid. A master cylinder converts mechanical force into hydraulic pressure through the brake lever acting on a piston that presses on a liquid. The size of the master cylinder, along with the force of the lever pull, determines the brake pressure applied on the rotor via the mini bike calipers and pads. Mini bike calipers are a pair of metal plates bonded with friction material - the brake pads. When you pull the brake lever, brake fluid creates pressure on pistons in the brake caliper, forcing the pads against the brake rotor and slowing your mini bike. One of our top quality mini bike rotors is the front disc brake plate rotor replacement for 50cc 70cc 90cc 110cc 125cc dirt bike. It is made of premium quality material, resistant to corrosion, durable to use.