How do bike rear brakes work?

Bicycle rear brakes work through a mechanical or hydraulic system to create friction between the brake pad and the rim or disc of the wheel, slowing down or stopping the bike.

1. Mechanical Disc Brakes:

- Mechanical disc brakes consist of a brake lever connected to a brake cable, which runs to a mechanical brake caliper.

- When the brake lever is pulled, the cable moves the caliper, pushing the brake pads against the brake rotor (disc) attached to the wheel.

- The friction between the brake pads and the rotor slows down or stops the wheel.

2. Hydraulic Disc Brakes:

- Hydraulic disc brakes also utilize a brake lever and brake caliper but employ a hydraulic system instead of a cable.

- When the brake lever is squeezed, it forces hydraulic fluid through a hose to the brake caliper.

- The pressurized fluid moves a piston inside the caliper, which in turn pushes the brake pads against the brake rotor.

- The friction between the pads and the rotor generates braking power.

3. Cantilever Brakes (Rim Brakes):

- Cantilever brakes are typically found on older bikes or some entry-level models.

- These brakes have two long brake arms attached to the frame and a cable that runs from the brake lever to a center pull mechanism.

- When the brake lever is pulled, the cable moves the center pull mechanism, bringing the brake pads closer to the wheel's rim.

- The brake pads rub against the rim, generating friction to slow down or stop the bike.

4. V-Brakes (Direct-Pull Brakes):

- V-brakes are another type of rim brake that has become more common in recent years.

- These brakes have two brake arms that move in a V-shape when the brake lever is pulled.

- The brake pads are directly connected to the ends of the brake arms and press against the rim of the wheel as the lever is squeezed.

- V-brakes offer more powerful braking than cantilever brakes.

5. Coaster Brakes:

- Coaster brakes are simple braking mechanisms commonly found on children's bikes and some older single-speed bikes.

- These brakes engage when the rider pedals backward.

- Back-pedaling causes a clutch inside the hub to engage, locking the wheel and bringing the bike to a halt.

In summary, bike rear brakes use mechanical or hydraulic mechanisms to create friction between the brake pads and the wheel's rim or disc, generating the force needed to slow down or stop the bike.