If your brake pedal suddenly sinks to the floor, you should:

Tap your horn to alert other drivers.
Pump the brake pedal to build pressure, and down shift into a lower gear or neutral to slow down.
Immediately switch the vehicle off.
Shift to a higher gear and pump the brake pedal to release pressure, then press the gas pedal.
Explanation

If your brake pedal suddenly goes to the floor and stops working, first pump the brakes to build pressure. As you pump the brakes, shift to a lower gear to help slow down. Then, try using your parking or emergency brake to stop. If these methods don’t work, let your tires rub against the curb to slow your vehicle, or pull off the road into an open space.

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