Air Loss Exceeds prescribed limit (Audible Air Leak)

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Air Loss Exceeds prescribed limit (Audible Air Leak)
Wheels are chocked, Brakes are applied, Truck is in neutral and parked in a safe location.
I will release both brakes, it's safe to do so, as my wheels are chocked.
I will lower down my glass to hear any audible leakage.
I'll wait for my pressure to be stable at 100 PSI.
I will shut down the truck when it reaches 100 PSI.
All our air tests should be performed between 90 and 100 PSI.
Switch it back on but only the ignition, do not start the truck.
Both breaks are already released.
Hold onto the brake pedal steadily and check the pressure.
My pressure is 99 PSI.
I look outside, try to hear any air leakage, there is no audible air leakage from outside and my gauges are stable at 99 PSI.
I am going to start the stopwatch at 99 PSI.
I will check in 1 minute how much pressure is dropped.
If in 1 minute I dropped more than 4 PSI it means it's a major defect.
Any Audible air leakage outside is a minor defect.
Keep on telling how many seconds are passed and how much air pressure is lost. Your foot must be firm and stable on the brake pedal during this test. If the foot is unstable or you release the pedal brake, you will lose pressure simultaneously.
In 1 minute I did not lose a single PSI. That means my system is working well.
Refer to Schedule 1
Audible air leak is a minor defect.
I will LOG into my LOG Book, Inform the Operator and I can drive the truck.
Air Loss Exceeds prescribed limit is a major defect.
I will LOG into my LOG Book, Inform the Operator and I cannot drive the truck.
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