Mark one answer
The parking brake isn't working
Increased air pressure
The air reservoirs are fully charged
Low air pressure
Explanation: It's dangerous to drive a vehicle with low air pressure. To alert you to this, all vehicles are fitted with a warning light and/or buzzer. Don't move your vehicle if this warning shows or sounds.
Category: Braking Systems
References: The Official DVSA Guide to Driving Buses and Coaches: Section 2, The Official DVSA Guide to Driving Goods Vehicles: Section 2
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