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📘 A disc brake has a rotor, pads, and caliper

A car disc brake is a compact machine built around three main parts.

3
lessons
~15 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Parts and hydraulicsIdentify brake parts and trace pedal force to hydraulic pressure.Rotor, pads, caliper, and fluid pressure link the pedal to the wheel.
  2. Clamping and heatExplain clamping torque, friction, and heat dissipation.Opposing pad forces create braking torque and convert motion into heat.
  3. Balance and releaseDescribe weight transfer, release clearance, wear, and the full loop.Safe braking balances tire grip, releases pads, and completes the stopping chain.

Questions this course answers

Which part turns with the wheel in a car disc brake?

The rotor is attached to the wheel hub, while the caliper and pads are held by nonrotating hardware.

What does the master cylinder create when the pedal moves its piston?

The master-cylinder piston reduces the fluid volume and creates pressure in the sealed brake circuit.

Why does a pad force on the rotor create braking torque?

A tangential friction force acting away from the axis produces a moment that opposes rotation.

What happens to most of a car's lost kinetic energy during friction braking?

Pad and rotor friction convert organized motion into heat that must then be dissipated.

Why do front brakes often do more work during a hard stop?

Deceleration shifts load forward, giving the front tires more available road force than the lighter rear tires.

What should happen when the brake pedal is released?

Lower pressure lets the caliper seal and hardware restore a narrow running gap between pad and rotor.

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