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Brakes

Brakes

Made of

Iron Leather Wood

Brief description

Brakes are mechanical devices that inhibit motion by absorbing energy from a moving system. They are used for slowing down or stopping a moving vehicle, wheel, or axle, or for preventing its motion, most often by means of friction.

Use / Function

  • Speed Control: Allowing for controlled deceleration of vehicles or machinery.
  • Safety: Providing a means to stop motion quickly in an emergency.
  • Stationary Holding: Keeping a vehicle or machine from moving when parked or at rest.

Operating principle

Brakes work by converting kinetic energy (motion) into thermal energy (heat) through friction. When a braking surface is pressed against a moving part, the friction between them creates a force that opposes the motion, slowing it down.

How to create it

Simple Block Brake

  1. Lever: A long handle or pedal that provides mechanical advantage.
  2. Brake Block: A piece of high-friction material (hardwood or leather-faced wood).
  3. Application: The lever is used to press the block directly against the outer rim of a wheel or a drum attached to an axle.

Drum Brake (Primitive)

  1. Drum: A cylindrical surface attached to the rotating axle.
  2. Brake Band/Shoes: A flexible band or curved shoes lined with friction material (leather).
  3. Mechanism: A system of levers or cables that tightens the band or expands the shoes against the drum.

Materials needed

  • Structural: Iron or Steel for levers and drums.
  • Friction Lining: Leather, Wood (hardwood), or later, specialized composites.
  • Hardware: Pivots, pins, and springs to return the brake to the off position.

Variants and improvements

  • Disc Brakes: A rotating disc is squeezed by pads held in a caliper. Offers better cooling and performance than drum brakes.
  • Hydraulic Brakes: Uses fluid pressure to transmit the braking force, allowing for equal pressure at all wheels.
  • Regenerative Braking: Modern systems that capture the kinetic energy and store it (e.g., as electricity) instead of wasting it as heat.

Limits and risks

  • Brake Fade: Excessive heat from prolonged braking can reduce friction, causing the brakes to “fade” or lose effectiveness.
  • Wear: Friction surfaces eventually wear down and must be replaced.
  • Lock-up: Applying too much force can cause the wheels to stop rotating entirely (skid), reducing steering control.
  • Heat Damage: Extreme temperatures can warp brake components or even set friction materials (like wood or leather) on fire.