When the electric retarder of a bus is operated, which mechanical components undergo direct friction against each other?

Question

DentroTest · Accepted Answer

The electric retarder (also known as an electromagnetic brake or eddy-current brake) works by creating magnetic fields that oppose the rotation of the driveshaft or the wheels. Since it acts through magnetic induction, it requires no physical contact or friction between mechanical parts to reduce the vehicle's speed. The options mentioning shoes and pads correspond to conventional friction service brakes, which do suffer mechanical wear and thermal fatigue (fading).

When the electric retarder of a bus is operated, which mechanical components undergo direct friction against each other?

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