What happens when the brake reservoir is full and your pedal goes to the floor?

If the brake reservoir is full and the brake pedal goes to the floor, it typically indicates a problem in the braking system, such as a leak in the brake lines, a faulty master cylinder, or air trapped in the brake lines. This situation can lead to a loss of hydraulic pressure, compromising the vehicle's braking ability. It's crucial to address this issue immediately, as it poses a significant safety risk. A qualified mechanic should inspect the braking system to diagnose and resolve the problem.