Brake Lines

As force is exerted on the brake pedal, brake lines carry brake fluid under pressure from the master cylinder to each wheel. Once at the wheels, the fluid pressure is converted back to mechanical pressure in the caliper or wheel cylinder. This mechanical pressure forces the brake pads or shoes to move against the rotating disc or drum at the wheels, creating friction to slow the wheel/tire unit. As long as the tires maintain friction (traction) with the road the vehicle will slow or stop.