When a car hydroplanes the most important thing to remember is not to panic. First, do not brake or accelerate suddenly. Since hydroplaning is a loss of traction to the front tires sudden braking slows the front tires but locks the rear tires which can cause a spin out. Also sudden acceleration could pull the vehicle straight ahead which could be dangerous if the vehicle is pointed toward the edge of the roadway.
What you should do depends on the type of vehicle you are in. If you are in a front wheel drive with or without ABS and traction control or a rear wheel drive with ABS and traction control and you begin to hydroplane, you should look for open space and plan to travel in that direction. Stay lightly on the accelerator and steer gently toward the open space you have identified. If you are in a rear wheel drive without ABS and traction control then look for open space and plan to travel in that direction. Ease off the accelerator and steer toward the open space you have identified.
It’s also important not to have the cruise control engaged in heavy rain due to a sudden acceleration problem. The vehicle will recognize the build up of water as a slow down and ask for more power. This may casue the car to shift to a lower gear and build even more water under the tires.
You can avoid hydroplaning by making sure the tread on your tires is thick enough and by slowing down. One way to check your tread is to place a penny upside down in your tread. If Lincoln’s head is hidden then your tread is thick enough. If it doesn’t hide Lincoln’s head then your tread is too thin and you need new tires. When it comes to speed on a wet road, slow down by about one third of what you would normally drive.
Original Source What to Do If You Hydroplane - DefensiveDriving.com