Why does the ABS warning light sometimes turn on and sometimes off?

[MaliaLynn]

ABS warning light intermittently turning on may be due to the following reasons: Reason 1: When using multiple vehicle electrical devices, the battery voltage drops below 10.5V. As the engine speed increases and the voltage rises, the ABS warning light turns off. The ABS system power supply voltage is too low, possibly due to poor terminal contact or inadequate grounding. Reason 2: Improper adjustment of the brake light switch or poor internal contact of the brake light. Solutions for intermittent ABS warning light activation are as follows: Method 1: Check the battery specific gravity; inspect the charging system; examine the power supply (such as voltage relay or poor power contact). Method 2: With the engine running, press the brake pedal, use a finger to push the brake switch linkage all the way down, then release the brake pedal to complete the self-setting position.