Before starting downhill in a commercial vehicle that uses an automatic transmission, drivers should:

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Before driving down a slope, drivers using vehicles with an automatic transmission should put the transmission into Low Range. This allows the engine to do most of the braking work. This type of "engine" braking is crucial for downhill driving as it prevents the brakes from overheating and also helps prevent excessive air pressure loss. Vehicle operation manuals will contain detailed instructions on how to properly use Low Range settings.

Before Starting Downhill in a Commercial Vehicle That Uses an Automatic