Answer :
Final answer:
A tractor's air system must be fully pressurized before movement, post pushing the trailer supply valve. This is to allow effective functioning of the brake system that operates best on incompressible fluid, hence, all air needs to be bled out.
Explanation:
Upon pushing in the trailer supply valve, the tractor should remain stationary until the whole air system is: a) Fully pressurized.
A gas, including the air in your brake system, is compressible. When a force is applied, such as when you press the brake pedal, the gas initially compresses and heats.
This means that for the brakes to function as effectively as possible, the air in the brake lines must be removed (or bled) until the system is fully pressurized.
Until this is done, the tractor should not be moved to ensure safety and brake efficiency.
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