Which type of brake utilizes a pinching action on a metal disc to slow or stop tire rotation?

The correct answer is the type of brake that utilizes a pinching action on a metal disc to slow or stop tire rotation, which is known as disc brakes.

Disc brakes function by having a caliper that squeezes brake pads against a rotating disc (or rotor) mounted on the wheel. When the driver applies the brake pedal, hydraulic pressure is generated, causing the caliper to push the pads against the disc. This pinching action generates friction, which effectively slows down or stops the wheel's rotation.

This system is widely favored for its efficiency in heat dissipation, responsiveness, and performance, especially in high-speed or high-performance scenarios. In contrast, the other types of brakes mentioned operate on different principles—drum brakes use a different mechanism involving shoes pressing against the inside of a drum, parking brakes typically engage a separate system for holding the vehicle stationary, and power brakes enhance braking force through a vacuum or hydraulic system but do not describe the specific action of pinching on a disc.