Dynamic Rear Proportioning (Aztek)
WARNING: This page does not describe the selected car, but rather 46 other vehicles, including the 2001 Pontiac Montana, 2001 Pontiac Aztek, 2001 Oldsmobile Silhouette, 2001 Oldsmobile Bravada, and 2001 GMC Sonoma. However, it is still accessible from the selected car via links, so may be relevant.
Dynamic Rear Proportioning (DRP) is a control system that replaces hydraulic proportioning function of mechanical proportioning valve in base brake system. DRP control system is part of operation software in EBCM. DRP uses active control with existing ABS in order to regulate vehicle's rear brake pressure.