Chassis – Braking systems
The integrated permanent brake system includes as standard a constant throttle engine brake as well as an exhaust brake. It reduces the work of the foot-brake and reduces wear on the brake linings.
This reduces the maintenance costs of the foot-brakes. The permanent brake system allows good control of the braking force, even making it possible to achieve high average speeds going downhill with a forward-thinking driving style.
On request, the permanent brake system can also be supplemented by a retarder.
Functional principle of the constant throttle:
A small, compressed-air activated auxiliary valve is located in each combustion chamber of the engine. It acts to decrease the pressure during the 2nd stroke (compression) and prevent the piston from being accelerated by the compressed air during the following 3rd stroke (power). This increases the engine braking effect.
Functional principle of the exhaust brake:
The exhaust brake is the second standard engine brake after the constant throttle. The braking force is increased by closing the exhaust flap. This produces back pressure, which brakes the motion of the piston during the 4th stroke (exhaust). At the same time, the fuel supply is cut off.