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.

[ODawson]

I noticed a decrease in the braking force of the hydraulic retarder. Common causes include aging or leakage of hydraulic oil, which is like the vehicle lacking sufficient 'blood,' resulting in reduced resistance. Additionally, excessive wear of the impeller components over time can lead to poor engagement, much like old gears not meshing tightly. Control system malfunctions, such as electronic module failures, can also occur. High temperatures may cause the fluid to thin out, reducing performance. These issues are quite common in my repair experience. I recommend checking the fluid level every six months—don’t wait until it’s completely leaked out. When driving downhill, pay extra attention, as weakened braking force can be dangerous. Typically, replacing the fluid or adjusting electronic settings can improve performance. Ignoring these issues and neglecting long-term maintenance can lead to complete system failure. Overall, this may seem like a minor issue but can cause significant trouble.

[OEva]

Having driven heavy vehicles for decades, I've encountered multiple instances of declining braking force in hydraulic retarders. The main causes are deteriorated or leaking hydraulic fluid, where insufficient levels reduce resistance. Components like impellers can wear out, leading to sluggish rotation, and control circuits may short-circuit. Continuous high-speed driving raises temperatures excessively, diminishing fluid resistance. These issues stem from harsh usage and inadequate maintenance. I've found that timely replacement with high-quality hydraulic fluid and regular system cleaning can prevent problems. Reduced braking force makes long downhill stretches particularly perilous, with poor deceleration increasing accident risks. A simple solution is to stop and check fluid levels, seeking repairs if necessary to prevent worsening. Safety comes first—never underestimate such seemingly minor issues.

[SkylarLee]

As a novice driver, I have studied issues related to hydraulic retarders. There are several reasons for the decline in braking force: insufficient hydraulic oil or deterioration in quality, which affects fluid friction. Mechanical components such as the impeller may be damaged. The control unit occasionally malfunctions. Performance becomes unstable at high temperatures. These are common occurrences while driving. It is recommended to maintain the system regularly to prevent a decline in performance that could lead to longer braking distances. Always test the retarder's condition before descending steep slopes.