Mechanical disc brakes are a disc brake system that transmits braking force via a steel cable, widely used on urban commuter bikes, entry-level mountain bikes, and folding bicycles. It operates by the rider pulling the brake lever, which pulls the brake cable to move the caliper pistons, pressing the brake pads against the rotor to slow down or stop the bike. Compared with hydraulic disc brakes, mechanical disc brakes have a simpler structure and are easier to maintain, making them suitable for everyday riding and budget-conscious riders.