What are bicycle brakes made of?

* Brake pads: Rubber compound

* Brake calipers: Aluminium, titanium, carbon fibre

Disc brakes:

* Rotors: Steel, stainless steel.

* Calipers: Aluminium alloys and sometimes composites

Other brake components:

* Brake levers: Aluminium alloys.

* Cables: Steel or synthetic (e.g. Kevlar)

* Housing: Plastic or metal; rubber-based on the inside

* Springs: Steel