How to Use a Retarder?

[JulietRose]

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.

[CarterLee]

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.

[DiSimon]

All mountain bus drivers know that improper use of the retarder can easily lead to accidents. Every time I see a long downhill sign, I toggle the control lever next to the steering wheel, starting with gear 1 to test the braking force. If the tachometer needle drops, it means it's working, and if the speed stabilizes, don't shift up further. If you hear a sudden increase in the humming noise from the chassis, quickly downshift—that's an overheating warning. A special reminder for beginners: always downshift to gear 1 before turning, otherwise the center of gravity shift is too dangerous. During every maintenance session, have the mechanic check the retarder fluid level and top it up if it's low. If you get the hang of using it properly, even running through winding mountain roads won't cause the brake pads to exceed temperature limits.

[RicardoRose]

Those who've driven trucks for over a decade know how to properly use the retarder: Push the control lever to gear 1 before descending, then shift to gear 2 after the vehicle begins decelerating. Keep an eye on the coolant temperature gauge – don't let it exceed 90°C as overheating will cause failure. Never directly engage gear 3 when speed exceeds 60 km/h to avoid driveshaft vibration. Use only gear 1 during rainy or foggy conditions for maximum safety. Immediately shut it off if you smell burning – there's an 80% chance the electromagnetic coil is fried. Perform maintenance cycles together with oil changes, with special attention to cleaning carbon deposits from the electric brushes.