Correct answer
Pressing the pads against the disc rotating with the wheel.
The pads, held by the caliper, press against the disc rotating with the wheel. Friction converts motion energy into heat and helps reduce speed. The pad does not rotate with the disc. This describes disc braking; other deceleration methods, such as engine braking or electrical regeneration, do not rely on pad-disc contact.
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Applying two stationary surfaces without acting on the wheel.
Making pads and disc rotate together without relative friction.
Pressing the pads against the disc rotating with the wheel.
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