What are the causes of brake light failure?
2 Answers
The causes of brake light failure are: 1. The car's brake disc is faulty or excessively worn, affecting the dashboard light; 2. Lack of brake fluid causing the warning light to illuminate; 3. A short circuit in the brake warning light circuit causing the warning light to illuminate. This indicator light is mostly used to display the wear condition of the brake disc and is usually in an off state. Solutions: 1. Severe wear of the brake pads. The car's brake pads have a manufacturer-set warning line. When the brake pads reach their usage limit, an alarm will be triggered. Regularly inspect the tire brake pads and use measuring tools to check the thickness of the brake pads. If the wear is significant, immediate replacement is required; 2. When braking, the brake fluid is compressed into the pipelines and the brake calipers. If the brake fluid level is low, the fluid level sensor will detect it and trigger an alarm via the warning light. Regularly check the brake fluid reservoir for low fluid levels and promptly add brake fluid; 3. There may be an open circuit in the wiring affecting the dashboard light alarm. Use a multimeter to check the car's brake pad warning circuit, brake fluid level warning circuit, and handbrake switch circuit to detect wiring issues.
I've encountered quite a few common causes of brake light failures. The main issue is burnt-out bulbs due to frequent use and limited lifespan, especially in older vehicles where bulbs age quickly and go out when braking. Blown fuses are also common, popping when current is too high to protect other circuits. Wiring problems like shorts or breaks often occur from aged, cracked wires, particularly in rainy weather. Poor contact in the brake switch frequently happens when dust accumulates in the pedal switch, blocking signal transmission. Relay failures or control module issues occasionally occur in premium vehicles. Unstable system voltage can indirectly affect lighting. My advice is to first check bulbs and fuses, then inspect switches and wiring if lights remain off. Brake light failure is extremely dangerous as it increases rear-end collision risks, so never delay repairs. Having mechanics inspect lighting systems during regular maintenance can prevent most issues - safe driving comes first.
