Having moisture in your air system is the #1 reason you have air system issues.
Volvo Truck Part Number: 85110799
The Air Dryer Cartridge is recommended to be replaced yearly due to being filled with particles that were filtered from the air. This filter will solve your slow build up and will help ensure your air going to tanks is filtered.
This process is going to be similar to all trucks with DD13 DD15 DD16 OM 471 OM 472 OM 473 ENGINES
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Changing out the air dryer cartage on a M923 military truck. In this I also put in a new air blow-down control valve.
I originally looked into this to help with a long whistling dryer blow down. It seemed like it had no effect but some youtube friends told me to give it some time before opening the dryer to work on the internal valving. 200 miles later and they were right. All of a sudden the whistling and long blow just stops and pops normally again. Guess it just took some time to work its way out of the system. Thanks guys, I was not looking forward to pulling that thing apart.