The wheel cylinders and calipers convert pressure developed in the system into:

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Hydraulic pressure is converted into mechanical force by wheel cylinders and calipers. In disc brakes, the brake fluid pressure from the master cylinder pushes the caliper pistons, which press the brake pads against the rotor. In drum brakes, the wheel cylinders push the brake shoes against the drum. The pressure acts over the piston area to produce a force that moves the pads or shoes, creating friction to slow or stop the vehicle. So the primary conversion inside these components is hydraulic energy (pressure) turning into mechanical force. Electrical energy, temperature change, or light emission are not what these components primarily produce.