The engine brake is a type of diesel engine brake that releases the compressed air in the cylinders so that the engine can slow down the truck. This can be a life saver for the in certain situations. However, there are several instances where you should not use them.
Slippery Road Conditions
Unlike your normal brakes that allow you to brake lightly in slippery conditions, the engine brake can apply too much braking torque to the wheels and cause them to skid. This may cause you to get into an accident if your truck jackknifes and you lose control. Avoid the engine brake when you’re on snow and especially on ice. Some truckers will use the engine brake on wet pavement by keeping the trailer lined up with the truck while moving in a straight line. However, we don’t recommend engine brake use on wet pavement.
Small Towns and Suburbs
The engine brake makes a loud machine gun sound that the residents of many small towns and suburbs don’t like. The commercial or owner operator truck driver should respect the wishes of the town when they see signs forbidding engine brake use.
Bobtailing
Braking when bobtailing, that is, braking while driving your commercial or owner operator truck tractor without a trailer, is more difficult than with the trailer attached. The tractor without its trailer has a lot of its weight above its front wheels with very little over the rear wheels. This causes the rear wheels to skid when braking hard. In addition, hard braking may cause the tractor to tip over in a forward direction. Bobtailing requires a light touch to the brakes. Just like in slippery conditions, the engine brake applies too much braking torque when bobtailing and will cause the same problems as hitting your foot brake too hard.
When to Use the Engine Brake
Use the engine brake on dry pavement when pulling a loaded trailer. It’s most useful at high speeds and when going down hills, and can be used in combination with your foot brake. Its proper use will reduce wear and tear on your brakes.
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