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The pressure is irrelevant, it's the volume of air and the weight it is trying to support. If the car weighs 2 tonnes and the weight is evenly distributed, that's 500kg per corner. So the pressure will be whatever it needs to be to raise the car to normal height. Load the boot so the rear bags are supporting 750 kgs each and the pressure will go up to lift the car to the same height. The system stores air at a pressure of around 150psi which is greater than the pressure needed to lift the car under all circumstances so the working pressure will be lower.
