Voith retarders – for greater safety, cost-effectiveness, and sustainability

Voith retarders – for greater safety, cost-effectiveness, and sustainability

Better braking – with Voith retarders for commercial vehicles

    With Voith retarders, up to 90 percent of all braking actions can be performed without wear. This represents a significant increase in safety. Retarders protect the service brakes, thus reducing expenditures on spare parts and maintenance. At the same time, transport capabilities increase due to higher average speeds.

    High brake performance is essential when it comes to stopping a bus that weighs several tons. Classic friction brakes can reach temperatures of up to 1000 degrees under demanding conditions such as adaptive braking on the highway or on long downslopes. This leads to a rapid reduction in braking efficiency. Voith retarders provide the solution: The permanent hydrodynamic sustained-action brake system ensures wear-free braking – and is always available, even during lengthy braking maneuvers. This protects the vehicle’s service brakes and ensures they are always available. Little wonder that sustained-action brakes in buses and trucks are a legal requirement throughout Europe.

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    Voith retarders – the advantages at a glance

    • Greater safety throughout the entire speed range ensured by high retarder brake performance and cold service brakes 
    • Downhill cruise control – using the v-constant function, the retarder maintains constant driving speed on downward slopes 
    • Lower operating costs – considerably longer periods without the use of service brakes results in fewer visits to the repair shop and lower maintenance costs 
    • Low weight – Voith retarders are light, allowing optimal use of load limits
    • Higher transport capabilities – due to higher and more uniform average speeds 
    • Lower consumption – more uniform speeds and proactive driving behavior saves fuel
    • Non-polluting – up to 80% lower emissions of brake dust

    The Voith retarder portfolio – the right solution for every vehicle

      Together with vehicle manufacturers such as EvoBus, Volvo and many more, we are developing customized retarder solutions.

      Water retarders

      The Voith Aquatarder provides braking using the engine coolant. This means there is no additional operating medium, no additional oil change, and no adjustment work. Voith’s secondary water retarder was awarded the European Transportation Prize for Sustainability and the ECW Innovation Label Award for its innovative, energy-saving and non-polluting approach.

      Oil retarders

      Using an oil supply that is independent of the transmission fluid, the oil in Voith’s oil retarders can tolerate the maximum permissible operating temperatures. The braking energy is transferred via the heat exchanger to the vehicle’s cooling circuit, where it is effectively dissipated.

      Hydrodynamic braking – retarder design and operation

        Voith retarder operating principles

        Hydrodynamic braking – retarder design and operation

        • Hydrodynamics makes wear-free braking possible.
        • The magnitude of the braking torque depends on fill level and speed. 
        • The retarder is perfectly integrated into the vehicle braking management system.
        • The braking energy is converted into heat and dissipated via the vehicle cooling system.

        Wear-free braking – how a retarder works

        The Voith Retarder 3250, cross-section including gearbox integration
        In the hydrodynamic retarder, there are two blade wheels that face each other. The rotor is connected to the vehicle’s universal joint shaft by means of the retarder drive shaft; and the stator to the stationary housing of the retarder. During braking, there is oil between the blade wheels. The oil is accelerated by the rotor and decelerated in the stator. As a result, the rotor is also decelerated, braking the vehicle. The braking heat created as a result is dissipated quickly and efficiently by the vehicle cooling system – without negatively impacting the surrounding components.
        Interactive flash animation for downloading

        Inline and offline retarders – a question of transmission


        The primary water retarder is directly connected to the engine’s crank shaft and is thus dependent on the engine speed.


        The secondary retarders are installed in the gearbox and brakes and are dependent on the speed of the drive shaft.

        Do you have any questions about Voith retarders?
        We’re here to help!


          Retarder Experts


          t + 49 7951 32-1555

          Contact our experts

          Service contact



          t +49 7951 32-531

          Contact our experts

          Technical Support

          Technical Support


          t +49 7951 32-1555

          f +49 7951 32-1506

          Contact our experts

          Spare Parts Order

          Spare Parts Order


          t +49 7321 37-4000

          f +49 7321 37-7805

          Contact our experts

          Further information about Voith retarders

            • Interactive flash animation for downloading

              ZIP, 0.30 MB

            Our Service - Part of Your Business

              Where your bus is in good hands

              Whether it’s maintenance or repairs, troubleshooting, or the functional testing of individual components: our professionals will make sure you stay on the road. At the Voith retarder workshop in Crailsheim, and throughout the world.

              Judge us by our performance

              • Onboard troubleshooting and upgrade 
              • Replacement and repair 
              • Repair of supplied retarders (all model series) 
              • Troubleshooting and functional testing of individual components 
              • Worldwide delivery of Voith original spare parts, as well as 
              • replacements and basic retarders 

              Retarder oil list

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