1996 GMC Savana Van Owner's Manual - Page 164

Wet brakes can cause accidents. They won't work well in a quickstop and may cause pulling one to side. You could lose controlof the vehicle. After driving through large puddle of water or a a car wash, apply your brake pedal lightly until your brakes work normally. 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. 4-16