Disc brakes cool faster; drums are still common on many semi-trailers and older models. The question is not “which is better” but what the vehicle manufacturer and the application call for.
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The vehicle manufacturer and the application decide. Discs cool faster. Drums are common on many semi-trailers and older models.

Five signs you can check yourself and three values measured on the test line.

The electronics that stop wheels locking — and why they matter for inspection and road safety.

Braking efficiency before the annual inspection: what is measured and where.