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What to Do When the Exhaust Brake Indicator Light Comes On?

2 Answers

DelJoy

07/25/25 3:42am

The exhaust brake indicator light coming on indicates that the vehicle's exhaust brake is in operation. If you do not wish to use the exhaust brake, you can manually turn off the exhaust brake switch. The exhaust brake serves as an auxiliary function. When the vehicle is in motion, the exhaust brake indicator light will illuminate when the driver presses the brake pedal or clutch pedal and will turn off when released. Exhaust brakes are widely used in large diesel vehicles. A regulating valve is installed on the engine's exhaust pipe, and the closure of this valve increases the pressure during the exhaust stroke, utilizing the generated negative pressure to obtain braking force. Since the fuel supply must be cut off during operation, the exhaust brake cannot be used in gasoline vehicles. Proper use of the exhaust brake can significantly reduce the use of service brakes, thereby reducing brake shoe wear and greatly lowering the risk of driving safety caused by continuous brake overheating.

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VonPenelope

08/10/25 5:05pm

I've been driving on the road for over 30 years. Don't panic when the exhaust brake indicator light comes on. Most likely, you forgot to turn off the exhaust brake switch—just switch it off. Or the switch might be stuck; try pressing it gently a few times. If the light remains on, it could be a wiring issue, such as a loose connection or a blown fuse. Find a safe place to pull over and check if the corresponding fuse in the fuse box is intact. Don’t attempt to fix anything complicated yourself—just drive to a repair shop and let the mechanics diagnose it to avoid affecting braking performance. Experienced truck drivers know that when a warning light comes on, it signals an issue with the system. Ignoring it could lead to wear on exhaust components. Spending a little on repairs is better than risking an accident. During regular maintenance, use compressed air to blow away dust near the switch to prevent poor contact.

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