In the video, a person is seen working on a car's brake system. The person is using a tool to adjust the brake caliper, which is a crucial part of the braking system. The brake caliper is attached to the brake rotor, which is the part of the wheel that comes into contact with the brake pads when the brakes are applied. The person is seen using a tool to adjust the position of the brake caliper, ensuring that it is properly aligned with the brake rotor. This adjustment is necessary to ensure that the brake pads make proper contact with the rotor and provide adequate braking force. The person's actions are deliberate and careful, indicating that they are experienced in working with brake systems. The video provides a close-up view of the brake caliper and rotor, allowing the viewer to see the details of the brake components and the adjustment process.