Various examples are directed to systems and methods for controlling a vehicle. Power may be provided to a cut-off valve in fluid communication between an automated control (AC) valve and a shuttle valve. The cut-off valve may be configured to open in response to the power, causing fluid communication between the AC valve and the shuttle valve. A vehicle autonomy system may modulate the AC valve to control a level of pressurized air provided from a pressurized air reservoir to a foundation brake via the AC valve and the shuttle valve. In response to an automated disengage signal, the cut-off valve may close to prevent pressurized air from reaching the shuttle valve via the AC valve and permit pressurized air to reach the shuttle valve via a pedal valve.