I always question that too. My R129 brakes definitely feel soft but it stops on a dime every time like Benzmac said. When I talked with the service advisor at the dealer, he commended me to have the brake worked on. But I found it astonishing that my brake can wear out that fast. Consider I do not drive the car that much -- less than 2,000 miles a year. I guess it is the design of the vehicle itself. Brakes on my W124, and W163 all act differently than one another, it seems each design has its own characteristic.