Telma vs Voith Retarder: The Difference
Telma and Voith are the two most common retarder brands in heavy vehicles. The key difference is the working principle: Telma slows electromagnetically, Voith hydraulically. This guide compares the two systems.
Telma (electromagnetic) retarder
A Telma retarder works through the magnetic field between a rotor and fixed coils. It has no wearing parts, responds quickly and usually needs no separate cooling circuit. Electrical-system and coil health are important for performance.
Voith (hydraulic) retarder
A Voith retarder creates resistance through oil flow between a rotor and stator. It offers high braking force and is usually integrated with the vehicle cooling system. Oil quality and sealing matter most in maintenance.
Which is better?
Neither is universally better; the right choice depends on the vehicle, application and existing hardware. What matters is the correct original parts for your system and maintenance done by a competent team.
KMQ Otomotiv supplies spare parts for both systems; workshop repair and overhaul cover Voith hydraulic retarders only.
Frequently asked questions
- Is a Telma or a Voith retarder more powerful?
- Both offer high braking force; the result depends on the vehicle and application. Correct installation and maintenance determine performance.
- Do you supply parts for both systems?
- Yes. KMQ Otomotiv stocks original and remanufactured spare parts for both Telma and Voith retarders, with same-day shipping.
Request a quote — keep your fleet on the road.
Send us your requirement; our technical team responds within 24 hours with the right part and solution.