What are the reasons for the decrease in braking force of hydraulic retarders?

[Joan]

The reason for the decrease in braking force of Voith hydraulic retarders is: current drop: an increase in the gap between the stator and rotor or prolonged operation time may lead to a decrease in braking force. The following are related content introductions: 1. Retarding efficiency: The retarding efficiency is higher than that of engine retarders, allowing downhill driving at higher speeds; small size and mass, can be integrated with the transmission. 2. Wear: No wear occurs during operation; the heat generated by the working fluid is easily dissipated, and the normal working temperature of the engine can be maintained during long downhill driving. 3. Braking torque: The braking torque tends to zero at low speeds, and wheels will not slip during braking on slippery roads. The disadvantages are long lag times for engagement and disengagement, power loss when not in operation, and complex structure when used in mechanically driven vehicles, especially in trailers.