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Why does the indicator light still stay on after releasing the air brake?

2 Answers

CarterLee

07/29/25 9:12pm

When the indicator light remains on after releasing the air brake, it may be due to poor circuit contact or the brake not being fully released. The air brake is a type of braking system. In automobiles, a series of specialized devices that apply a certain force (primarily on the road surface) to specific parts of the vehicle (mainly the wheels) to enforce a certain degree of braking are collectively referred to as the braking system. The car's brake pedal is located below the steering wheel. Pressing the brake pedal activates the brake lever linkage, which transmits pressure to the brake shoes on the brake drum, clamping the brake disc and causing the vehicle to decelerate or stop. The manual brake in a car is located beside the gear shift and is connected to the brake lever.

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LaCarlos

08/15/25 7:32pm

As a veteran heavy truck driver with over a decade of experience, I've encountered the issue of the parking brake warning light staying on twice. The first time it happened was truly frightening - I was terrified of losing braking power on the road. The most common cause is insufficient system air pressure, which could be due to reduced compressor efficiency, minor air leaks in the tubing, or an improperly closed air tank drain valve. If the light comes on right after starting the engine, it's normal since the air pressure hasn't built up yet - just wait patiently. But if it stays on after driving for a while, you need to investigate immediately. Once I ignored it while rushing for delivery and nearly caused an accident. My experience tells me this warning light is no joke - if it stays illuminated, never force the vehicle to move. Pull over immediately to thoroughly check the air system for any hissing leaks and verify if the pressure gauge needle reaches above 6 kg/cm². If you find the pressure won't build up, absolutely don't operate the vehicle - calling a tow truck is far safer than taking the risk.

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