Hi all, I have a 1991 A2 with the ABS sisten and all. I have the Haldex N50011F air dryer. It tends to stick open sometimes where the system blows down for the past couple years. I have been playing with it by cleaning and giving it its best shot at working. Are there any practical civilian or military replacements for this dryer? I would rather not invest the time and money to rebuild this valve if it is a flawed design. I was looking for something cost effective that does not involve me stopping every 5-50 miles to bump the valve. Any help would be appreciated. Thanks!