The video shows a person working on a car's brake system. The person is using a red tool to adjust the brake caliper. The brake caliper is attached to the brake rotor, which is part of the car's braking system. The person is seen using the tool to make adjustments to the brake caliper, which is a crucial part of the braking system. The video provides a close-up view of the brake caliper and the tool being used, allowing viewers to see the details of the adjustment process.