What should you do in case of a parking brake malfunction?

Answer: B — Consult the operation manual and seek repairs

In the event of a parking brake malfunction, consulting the operation manual and seeking repairs is the most appropriate response. This course of action ensures that you follow the manufacturer's guidelines for addressing the issue correctly and safely. Operating a vehicle with a malfunctioning parking brake can be hazardous, as it increases the risk of the vehicle rolling unexpectedly when parked, which may lead to accidents or damage. By referring to the operation manual, you gain access to specific diagnostic procedures and instructions tailored to the vehicle's braking system. Additionally, seeking professional repairs helps ensure that the issue is resolved accurately, maintaining the vehicle’s overall safety. It is crucial to address brake malfunctions promptly, as they are essential for safe vehicle operation, especially in a commercial driving context where regulations around vehicle safety are strictly enforced.