Can't find the VW proportioning valve you're looking for? We have more than 20,000 VW parts in stock and not all of our parts are listed online. So call us at (586) 757-2300 with your VW proportioning valve questions. We'd love to share our thirty years of Volkswagen knowledge and experience with you. We understand that a properly functioning VW proportioning valve is crucial for the safety and performance of your Volkswagen and we're here to help you keep your VW on the road.