eli5 Why do trains with steel wheels have traction on steel rails, but if your brakes on your car are used up and become steel on steel they dont work anymore?
In: 1231
The whole question is flawed.
Steel on steel brakes WORK just fine. The automotive mechanic forums are full of people showing up with completely worn out brake pads and only complaining about a slight noise (if anything).
In fact, steel on steel often has a higher coefficient of friction than brake pads.
Steel on steel just wears much, much faster than brake pads do.
Examples:
Yeah, go ahead and turn the rotors for me!
byu/gaphoogy inJustrolledintotheshop
Just another paper thin rotor
byu/collegefurtrader inJustrolledintotheshop
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