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| Rusted brake system proportioning valve |
If you live in an area with high humidity, or where the salt use is common in winter months, undercoating and rustproofing can help to protect the car body and chassis components of your car from corrosion. Look at the picture, this is a proportioning valve, part of the brake system. It's located underneath the car and as you can see, it's completely rusted, even though this vehicle is only five years old. This happened because this vehicle was driven in a "rust belt" area with high humidity and lots of salt on the roads in winter. Sometimes later, one of these brake lines can burst and the car will have no brakes.
Properly done undercoating and rustproofing can protect important components of the car from corrosion.