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).
Squeaking/Worn Brake Pads May Require Rotor Replacement Also on Mercedes-Benz 300TE 4MATIC
Average mileage: 250,000 (250,000–250,000)
5 people reported this problem
1990 Mercedes-Benz 300TE 4MATIC 250,000 mi, Visitor
I think all of the 300te wagons form this brake lip. The rotors must be replaced when this occurs.