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Originally Posted by dceite I always have never understood this. Truck drivers, buses, and other big diesel vehicals always revv the engine while turning it off(or should i say just the moment they turn off)? Why is it so? Any technical reasons they are told to do so? |
To answer your question specifically - Most truck and buses have air brakes. This air is stored in a tank and needs to be charged and therefore these guys rev the engines before they stop and just after they start so that they have some kind of braking power. The rest of it is hogwash.