Question

how hydraulic break works?

Answer 1

As the pedal moves down, it pushes a class 2 lever (a kind of simple machine), increasing your pushing force. The lever pushes a piston (blue) into a narrow cylinder filled with hydraulic brake fluid (red). ... When the brake pad touches the brake disc, friction between the two generates heat (red cloud).

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Answer 2

A hydraulic brake is an arrangement of brakingmechanism which uses brake fluid, typically containing glycol ethers or diethylene glycol, to transfer pressure from the controlling mechanism to the braking mechanism