1997 GMC Safari Owner's Manual - Page 193

Wet brakes can cause accidents. They won't work as well in a quick stop and may cause pulling to one side.You could lose controlof the vehicle. After driving through a large puddle of water or a car wash, apply your brake pedal lightly until your brakes work normally. Hydroplaning Hydroplaning is dangerous. So much water can build up under your tires that they can actually ride on the water. This can happen if the road is wet enough and you're going fast enough. When your vehicle is hydroplaning, it has little orno contact with the road. Hydroplaning doesn't happen often. Butit can if your tires do not have much tread or if the pressure in one or more is low. It can happen if a lot of water is standing on the road. If you can see reflections from trees, telephone poles or othervehicles, and raindrops "dimple" the water's surface, there couldbe hydroplaning. Hydroplaning usually happens at higher speeds. There just isn't a hard and fast rule about hydroplaning. The best advice is to slow down when it is raining. Driving too fast through large water puddles or even going through some car washes can cause problems,too. The water may affect your brakes. Try to avoid puddles. But if you can't, try to slow down before you hit them.