Why does the dashboard background light come on when stepping on the brake?

[SanBraxton]

When the brake warning light on the dashboard illuminates while stepping on the brake, it indicates a loss of hydraulic pressure in the braking system or the fluid level in the master cylinder being below the average. Here are some additional details: Check the master cylinder fluid level: In any case, first check the fluid level in the master cylinder. Adding brake fluid to the master cylinder reservoir can temporarily resolve the issue, but if there is a leak, the new fluid will soon be lost, and the warning light will come back on. Reason: If there is a leak, the brake fluid reservoir needs to be inspected as soon as possible to determine if the low fluid level is the cause. There are many possible causes for leaks, such as: brake hoses, brake lines, disc brake calipers, drum brake wheel cylinders, or the master cylinder itself may be leaking. Wet spots at hose or line connections indicate that the leak needs to be repaired. Inspect the hydraulic circuit: The two hydraulic circuits of the braking system are separated in most rear-wheel-drive vehicles, so one circuit applies the front brakes while the other applies the rear brakes.