BASIC OPERATING PRINCIPLES
Instead of the traditional expanding brakes that press outward against a circular drum, disc brake systems utilize a disc (rotor) with brake pads positioned on either side of it. Braking effect is achieved in a manner similar to the way you would squeeze a spinning phonograph record between your fingers. The disc (rotor) is a casting with cooling fins between the two braking surfaces. This enables air to circulate between the braking surfaces making them less sensitive to heat buildup and more resistant to fade. Dirt and water do not affect braking action since contaminants are thrown off by the centrifugal action of the rotor or scraped off by the pads. Also, the equal clamping action of the two brake pads tends to ensure uniform, straight line stops. Disc brakes are inherently self-adjusting.
Your car uses a pin slider front wheel caliper. The brake pad on the inside of the brake rotor is moved in contact with the rotor by hydraulic pressure. The caliper, which is not held in a fixed position, moves slightly, bringing the outside brake pad into contact with the disc rotor.