Technician A says the frictional energy on the drum surface creates heat, and this heat is dissipated to the surrounding air as the drum rotates with the wheel. Technician B says the thinner a drum gets, the better its ability to absorb and release heat. Who is correct?

Question

Quizplus · Accepted Answer

Friction between the drum surface and brake shoes causes heat to be generated which is dissipated to the surrounding air as the wheel and drum rotate. This means that Technician A is correct. However, Technician B is not correct since a thinner drum will have less thermal mass and, thus, will have a lower ability to absorb and release heat.

Technician a Says the Frictional Energy on the Drum Surface