What should you do first if the brake pedal goes to the floor while applying the foot brake?

When the brake pedal goes to the floor while applying the foot brake, the first step you should take is to pump the brake pedal several times. This action can sometimes build up pressure in the brake system, potentially restoring some braking ability temporarily. It allows the driver to gauge whether the problem is a temporary loss of pressure that might be remedied by this action or a more serious issue requiring immediate attention.

Pumping the brake may also activate the brake system if there is a small amount of fluid still present or if the air bubble in the brake lines can be compressed, which may help the driver control the vehicle for a short distance and locate a safe place to stop.

In emergency scenarios, it's also crucial to consider that you must act quickly and effectively. While other actions, such as pulling over or checking fluid levels, are important, they may not offer an immediate solution for maintaining control of the vehicle, making the pumping of the brake pedal a vital first step.