Known as the "fourth brake," the retarder is an ideal and economical deceleration system.
Developed with a focus on safety, the retarder is a non-contact type, which means there is no physical wear, making it an ideal auxiliary brake system. TBK has been developing retarders since the 1960s, and they have been adopted in buses, trucks, and other vehicles.
Building on this long history of technical expertise, the current electromagnetic and electronically controlled retarder (eddy retarder) was born, and it is widely used and trusted by many customers.


By directly controlling and decelerating the propeller shaft, the retarder reduces the load on the brakes, suppressing fade and vapor lock phenomena. Its effectiveness is enhanced when used together with auto cruise control. Additionally, it reduces the need for foot brake operation, thereby lessening driver fatigue.
Equipped with advanced technology, the non-contact, electromagnetic, electronically controlled retarder with quick response contributes significantly to enhancing vehicle safety. It plays an effective role in speed control and maintaining vehicle distance in autonomous driving systems.
Since it is mounted directly on the propeller shaft, no modifications are required. With no friction components, it is maintenance-free. Furthermore, being air-cooled, it requires no cooling equipment.