Voith Aquatarder SWR – the first secondary water retarder

    Safe, cost-effective, and sustainable – the Voith Aquatarder SWR is the first secondary retarder that brakes with water. The SWR uses the engine coolant as its operating medium. This means no additional oil changes, and no adjustment work. With its compact design, it requires 50% less installation space and is 35 kg lighter than a comparable oil retarder. The Aquatarder SWR was developed especially for the heavy-duty Mercedes-Benz series Actros and Arocs.

    Features and benefits

    • Higher safety
    • Maintenance-free
    • Low service costs
    • Fewer visits to workshops
    • Less fuel consumption
    • Less emissions

    Technical Data

    Voith Aquatarder SWR  
    Step-up ratio i = 1,68 / 1,97 / 2,13
    Max. braking torque at the propshaft 3 500 Nm
    Standard operation Multifunction lever 5-stage
    + function v-const
    option: foot control
    Operation medium Engine coolant in compliance with Mercedes-Benz operating instructions
    Control medium compressed air
    Unit weight approx. 42 kg
    Nominal voltage 24 V


    CAN-Bus-specific RCM (Retarder Control Module)

    Functional principle



        Service – where your truck 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

          Do you have any questions about Aquatarder SWR? We’re here to help!

            Service contact

            Voith GmbH & Co. KGaA

            Mobility Service

            Hardtstraße 8 74564 Crailsheim, Germany


            t +49 7951 32-531

            Technical Support

            Technical Support


            t +49 7951 32-1555

            f +49 7951 32-1506

            Spare parts orders

            Spare parts orders


            t +49 7951 32-1644

            f +49 7951 32-756