 I bought my 1998 Audi A4 Avant from a dealer at with 45,000 miles on it coming of a 3 year lease.  I have only replaced the front rotors and resurfaced rear with brake new pads.  I have 75,000 miles on the car today. Maybe I'm lucky.  This is my 4th Audi in 12 years and the only real problem I had were the denso A/C compressors on the 90 series.