Correct answer
Secure it so it cannot move
Before uncoupling, the towed vehicle must be secured against unintended movement, for example with the parking brake and the intended immobilization means.
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Secure it so it cannot move
Release all locks before immobilizing it
Leave it free to better check the support
The real exam in English is a translation of the Spanish original; compare both here.
Show the Spanish original
Antes de desacoplar un remolque o semirremolque, una medida básica de seguridad es:
- Asegurarlo para que no se desplace(Correct answer)
- Aflojar todos los seguros antes de inmovilizarlo
- Dejarlo libre para comprobar mejor el apoyo
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