Commercial vehicles are frequently equipped with devices like Engine Brakes and Retarders which slow the vehicle without having to use brakes.
These devices do not replace the brakes but can be used to slow the vehicle down without having to use the brakes.
Here are some examples:
What Is Engine Braking? What Is A Jake Brake?
ENGINE BRAKING | How Semi Trucks Slow Down Without Brakes
How A Jake Brake Works (2015)
Driving with Jake – History and Guide to Using Your Jake Brake Engine Brake (2001)
What Every Truck Driver Should Know About Engine Braking (AKA the Jake Brake!)
Voith Retarder Animation – Function RetarderTransmission Retarder
ZF-Intarder. Secondary retarder for modern commercial vehicles
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