I've made brake rotors out of Lead, Aluminium, and Copper.

In this video, I make Brake Rotors from scratch auto of Lead, Aluminium, and Copper alloy. I chose these metals because they are very different one to each other.
It was relatively easy to cast Lead and aluminum. The tricky part was to cast copper because of its height melting point ​(1084.62 °C, ​1984.32 °F).

I didn't know what to expect when I tested the brake disc made of copper alloy. I thought it would melt, but it didn't.
For the Rotor made from aluminum, I melted cans made from aluminum alloy Al 3004 / Al 5182 and some Grounding wire Al5052. I was not surprised that it is brittle and breaks into pieces subjected to massive forces.
Lead is very soft and highly malleable. It made a spectacular show in our video; because of the friction, the Disk started melting, spurting like a stream, and solidified instantly before falling to the ground.

Rotors Weigh:
Original cast iron 3,9 kg/8.5lb
Lead 8,2kg/18lb
Aluminium 1,7kg/3.7lb
Copper 5,6 kg/12.3lb

The moral of the story: Don't make brake Rotors out of Lead :)
Enjoy!
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WARNING: This video is only for entertainment purposes. If you rely on the information portrayed in this video, you assume responsibility for the results. Have fun, but always think ahead, and remember that every project you try is at YOUR OWN RISK.