Answer :

In a dual air brake system, the trailer's air brake system is activated by the tractor's air brake system. Pressurized air is sent from the tractor to the trailer, which then activates the trailer's air brakes. It requires a constant source of pressurized air from the tractor to function properly.

In a dual air brake system, also known as an air over hydraulic brake system, the trailer brakes are applied by a separate air brake system on the trailer. When the trailer breaks away from the tractor, the trailer's air brake system is still able to function independently.

The trailer's air brake system is activated when the driver applies the brakes in the tractor. This action causes the tractor's air brake system to send pressurized air through the service line to the trailer. The pressurized air then activates the trailer's air brakes, causing them to engage and slow down the trailer.

It is important to note that the trailer's air brake system requires a constant source of pressurized air from the tractor to function properly. If the connection between the tractor and trailer is completely severed, the trailer's air brakes will not be able to apply.

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