Final answer:
If a low pressure warning activates for one system in a dual air brake system, you should immediately stop the truck or bus, do not continue driving, and have the brake system repaired before continuing.
Step-by-step explanation:
When your truck or bus has a dual air brake system and a low pressure warning comes on for only one system, the correct course of action is to:
- Immediately stop the vehicle and safely park it.
- Do not continue driving as this may pose a risk not only to you but to other road users as well.
- Have the brake system repaired before proceeding.
The dual air brake system in such vehicles is designed to provide a backup in case one system fails, but driving with one system at low pressure is not safe and can lead to brake failure. While the other system might still be operational, depending on it alone is not a recommended practice. Regular maintenance and proper care of your vehicle's brake systems are important for ensuring safe operation.