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Turbo Retarder Clutch VIAB

The Turbo Retarder Clutch VIAB is a completely new start-up and braking system

With a fill-regulated, hydrodynamic fluid coupling as the main component, it unites the hydrodynamic start-up and hydrodynamic braking functions into one system.


Handling heavy transporters made easy:

The Turbo Retarder Clutch VIAB


Powerful start-up and safe braking - with no wear and for loads up to 250 tons. With the Turbo Retarder Clutch (from the German: Wear-free Integrated Starting and Braking system), two elements that appear to be mutually exclusive work together: The advantages of hydrodynamics when starting and braking with the high efficiencies of a mechanical driveline while driving.

Stress and tension behind the wheel? Not anymore. VIAB scores high when it comes to sensitive start-up and braking behaviour, as well as driving comfort. Just put your foot on the metal. As usual, simply pull the lever and the retarder decelerates safety and without wear. As many times as you like. Forget about overheating problems and all the other disadvantages of traditional torque converter solutions.

Experience it for yourself: The Turbo Retarder Clutch VIAB is a standard feature in the Mercedes Benz Actros SLT.

Powerful start-up and safe braking - with no wear and for loads up to 250 tons.

Principle of operation

Principle of operation diagram

ÜK Converter lockup clutch
D Torsional vibration damper
TK Fluid coupling
P Impeller
T Turbine wheel
R Rotor
S Stator
F Free wheel coupling
TB Turbine brakes

Upon start-up, the motor transfers power via the hydrodynamic circuit, as well as the downstream free wheel, to the transmission input shaft. Parallel to the circuit, a conventional friction coupling is arranged as a converter coupling.

When braking, the turbine brake arrests the turbine wheel. The system turns into a high performing retarder.


Turbo Retarder Clutch
VIAB - Trucks

Voith GmbH & Co. KGaA
Commercial Vehicles
Alexanderstraße 2
89522 Heidenheim, Germany

Mercedes-Benz Roadstars-Film

The wear-free Turbo Retarder Clutch combines the functions of a hydrodynamic start-up clutch and a primary retarder in a single component..


Technical Support
Tel. +49 7951/32-1555

Spare parts orders
Tel. +49 7951/32-1644

Fax +49 7951/32-574

Ms Sabrina Lipok:
Tel. +49 5341 21 5446
Mr Sascha Koch:
Tel. +49 5341 21 4872

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