Due to the size and material used on the brakes of these vehicles, the brakes may start to squeak around the 50 percent wear point. The brake rotor surfaces become uneven, causing a lip to form at the outer edge of the rotor. Because of this, the rotors are usually replaced when the pads are worn (pad life varies depending on driving style and terrain).Google+
Car Problem Reports
Mercedes-Benz SLK320 Replace Brake Rotors When Pads are Worn and Squeaking
Mercedes-Benz SLK320 Problem
Visitor, 2001 Mercedes-Benz SLK320, 96,000 mi
My mechanic says it will cost $400 to replace the rear brake pads only because the rotors have to be cut regardless whether you have only worn about 50% of the pads. Also, part of that cost is $100 to flush out the brake fluid. $400 is very pricey for a brake job. I am shopping around. Any suggestions?