Brake Problems

Hold the steering wheel firmly.
If this happens before entering a turn, try to control the direction first.
Then try to slow down: shift down gears step by step to slow down.
Use the handbrake/emergency brake to stop the car if the speed is below 20 mph.
Turn on your hazard lights if applicable.
Use upward slopes or hills to help stop the car.
If your brakes stop working when going up a hill, shift quickly to lower gear, then use the handbrake/emergency brake to park the car.
If available, park in an emergency parking lane, or hard shoulder. If not, then park away from fast traffic and ensure your hazard lights are turned on.

How to avoid it:

Test brakes before your trip.
Always test your brakes when you first start down a steep hill or if you have driven through deep water.