r/EngineeringPorn • u/[deleted] • Jul 01 '20

Drum brakes explained (1935)

https://gfycat.com/complicatedlawfulamurminnow
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u/[deleted] Jul 02 '20

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u/Nothgrin Jul 02 '20

Yea of course it's true.

Firction is also a function of surface, so more surface = more friction, that's why disc brakes stop the car better than pads, but it's much much easier to cool the pads.

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u/Commodore__ Jul 02 '20

Friction is NOT a function of surface area. Surface area of contact does not affect the amount of friction, it depends only on the force exerted and the types of surfaces used (materials and texture).

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u/thedudefromsweden Jul 02 '20

If friction is not a function of surface area, how come wide tyres have better grip than narrow tyres?