If you have a park brake system that is not functioning properly, it is best to avoid driving altogether. However, if you find yourself in a situation where you must drive with a limited park brake function, there are some things you should keep in mind. First, go slowly and carefully. Avoid sharp turns or sudden stops, as this could cause your car to skid or slide. Also, be sure to engage the parking brake every time you come to a stop. This will help ensure that your car remains stationary and does not roll away. Finally, always keep an eye on your speed and pay attention to your surroundings. By following these tips, you can safely drive with a limited park brake function.