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).
Car Problem Reports
Mercedes-Benz SLK230 Replace Brake Rotors When Pads are Worn and Squeaking
Mercedes-Benz SLK230 Problem
Driving down road, squeaking noise starts from Right Side, sounded like coming from tire area. Had in shop while under warranty, they said they could not find anything...now out of warranty, they want me to take it back in.
Visitor, 2003 Mercedes-Benz SLK230
Breaks squeaking; rotors and pads replacement