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At low engine speed, while in high gears
At high engine speed, while in low gears
During stop/start town work
While travelling at a constant speed on a motorway
Explanation: An exhaust brake alters the engine's exhaust flow, using it to help control the vehicle's speed. It's most efficient when the engine is running at a high speed and the vehicle is in a low gear, such as when descending a long hill. Using the exhaust brake can relieve the service brakes, preventing them from overheating and fading.
Category: Braking Systems
References: The Official DVSA Guide to Driving Goods Vehicles: Section 2
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