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The brake system in your vehicle is comprised of a disc, also called a rotor, a caliper, and the brake pad. From inside the car, it seems like all that happens is a push on the brake pedal, and the vehicle stops. But inside the car, this depressed pedal sends brake fluid through the brake lines as a piston moves in the master cylinder. As pistons in the caliper are initiated, the brake shoe pushes against the rotor, causing friction on the brake drum. Essentially, this pressure caused by your brake pad on the drum will slow the roll of your vehicle, and eventually cause it to stop.
Unfortunately, the friction of your brakes causes your brake pads to wear down over time, and they will need to be replaced time and time again. This is a normal part of the preventative maintenance routine you should include with your braking system.
Of course, this means spending some money to keep your vehicle in working order and get you home safely every day. So how much money are you looking at spending for brake repair?