A cessation of normal operation WordNet 3.0 & Open English WordNet

A vehicle breakdown is a mechanical or electrical failure of a motor vehicle in such a way that the underlying problem prevents the vehicle from being operated or impedes the vehicle's operation so significantly that it is very difficult, nearly impossible, or else dangerous to operate. Wikipedia

Failure of a motor vehicle in such a way that it cannot be operated Wikipedia Disambiguation

A failure, particularly mechanical; something that has failed. Wiktionary

Failure, particularly mechanical. Wiktionary (translation)