I need some trouble shooting help for a MK48 air dryer. The LVS is having trouble airing up. During the loading cycle the purge valve is dumping air making getting the pressure up hard. It looks like a Wabco super saver twin model. Is it likely just a problem with the purge valve or could it be something up stream. Anyone got the part numbers for the drier, the purge valve and the dessicant canisters.
Regards
Cody
Regards
Cody