Brake Drum Wheel Cylinder problems of the 2003 Chrysler Voyager

Recently I noticed the brake pedal was "spongy"- I inspected the brake system and found a steel portion of left rear brake line assembly rusted and leaking. The line fell apart completely during removal. The line assembly was replaced. I do have the old line assembly for inspection. This vehicle has brakes that wear out more frequently than any other vehicle I've ever owned. I've had to replace the front brakes twice and the rear brakes and wheel cylinders in less than 60,000 miles. When I try to obtain replacement parts for the front brake system I invariably receive the wrong parts- I have to get parts listed for a 4 cyl. Vehicle even though mine is a v-6. I have tried several name-brand parts manufacturers and all have the same issue. I believe my vehicle was assembled at the factory with the wrong front brake system which is underrated and results in premature wear. I have also, on a previous occasion, had an issue with an "abs" light and "brake" light coming on- even though my vehicle does not have anti-lock brakes. At that time there were no leaks or other faults to cause the warning lights. I was forced to pay the dealer to "re-flash" the computer which was improperly programmed by the manufacturer. The manufacturer had a TSB for this condition and I believe there should not have been a charge to correct a manufacturing defect. This vehicle has had several brake system problems which should not be occurring on a vehicle with less than 60,000 miles!.