Engineered for optimal trouble-free performance, the Graham-White QBA40 SludgeBraker air dryer is designed for severe-duty transit bus applications to assure quality brake air is always available. Patented multi-stage filtration combines with advanced twin tower drying technology to produce clean, dry air. QBA40 filtering removes heavy sludge oil, carbon and dirt contamination while eliminating liquid water to prevent airline freezing. Features include field-serviceable Digital Humidity Sensor, continuous health monitoring and CAN-Bus communication for real-time dryer performance of air quality with reports of operational issues. Service feedback based on actual dryer usage. Easy to install and maintain, filter serviced in minutes.