The first step would be to perform some basic inspections on the valve and try to establish what potential causes might exist (such as a leak or an incorrect spring). If the valve is a piston-type valve and has not been maintained (cleaned and lubed) in some time, then that should be done first. Depending on the conditions where you drive the vehicle, the valve should be maintained every 1-3 years to keep it working properly.
The next step would be to check for any potential leaks on the air supply side of the valve. Finally, the valve internals themselves should be checked for a potential leak/air loss. It’s important to be aware, that just as in a leak down test with an internal combustion engine, a small amount of air loss past the valve piston is normal and to be expected.
If you still need further assistance, then you should reach out to the support team at one of our 3 offices (Australia, UK, and USA). Before initiating this contact, gather as much info as possible about what the problem is, including what the conditions are when it happens (engine temp, vehicle speed, engine speed, etc…), as well as any other relevant info (including photos and videos if available). The more information you provide, the better our support staff will be able to assist you.
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