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Name: Rafi
Status: Other
Grade: Other
Location: Pakistan
Country: United States
Date: November 2008


Question:
Why brake pads, when pressed against a steel drum, loose friction at very high temperatures?



Replies:
There are probably a number of causes, but an important one is that the steel drum "polishes" the brake pad, so that the friction between the two components is less. The ability to stop depends upon converting the kinetic energy of the vehicle into heat. Heat between the drum and brake pads, and heat between the tires and the road. In the second mechanism "slamming on the brakes" and locking the tires softens the rubber tires also reducing the friction.

Vince Calder



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