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How to Use a Retarder?

2 Answers
JulietRose
09/01/25 7:49am
To use a retarder: After the vehicle is ignited, the retarder enters standby mode. When deceleration is needed, simply pull the manual control switch handle progressively to the desired gear position. The working principle of a retarder is: After activation, it alters the operation of the engine's exhaust valves, converting the engine into an air compressor that absorbs power, thereby providing deceleration force to the vehicle's drive wheels. The function of an automotive retarder is to generate reverse torque, decelerating the vehicle to achieve a braking effect. Automotive retarders are classified into: 1. Engine retarders; 2. Hydraulic retarders; 3. Electric turbo retarders; 4. Motor retarders; 5. Aerodynamic retarders.
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CarterLee
09/14/25 3:32am
After driving trucks for so many years, the retarder has been a lifesaver on long downhill slopes. The operation is quite simple: turn on the handle switch in advance before descending, don't wait until the speed picks up. Gradually increase the gear from low to high, just like the knob on the truck dashboard—1st gear has the lightest braking force, while 3rd gear is the strongest. The key is to adjust according to the slope. If you notice the trailer starting to skid in the rearview mirror, immediately downshift. Remember, it becomes ineffective when the speed drops below 20 km/h, so you'll need to use the foot brake in combination. Never use high gear on rainy or snowy days, as the wheels are prone to locking up. Check the wiring connections monthly for rust—this thing saves brake pads and lives.
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