In large vehicles like the Mercedes Travego, the retarder is a wear-free hydraulic or electric braking system. The distinct "whining" or "humming" sound listeners enjoy comes from the relationship of gears rotating in reverse to slow the vehicle without using the friction brakes.
The video titled (translated as 3 Hours of Rain on Glass, Bus Retarder Sound, and Mercedes Benz Travego Journey ) is a popular ASMR and sleep-aid video on platforms like YouTube . In large vehicles like the Mercedes Travego, the
In actual Mercedes-Benz Travego buses, the retarder is a critical safety and efficiency feature that reduces maintenance costs by taking the strain off the primary brake pads. Newer models also feature advanced safety systems like and PRE-SAFE Sound , which emits a "pink noise" to protect passengers' hearing during an imminent collision. In actual Mercedes-Benz Travego buses, the retarder is
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