A SYSTEM FOR IMPROVED ENGINE BRAKING

The invention provides an operation system for a vehicle, comprising an internal combustion engine () comprising a cylinder (), and an exhaust guide () being arranged to guide a gas flow from the cylinder () to the atmosphere, wherein the vehicle operation system further comprises a pneumatic system (), and an air conduit () connecting the pneumatic system () with the exhaust guide () for allowing a flow of compressed air from the pneumatic system into the exhaust guide ().