For the do-it-yourselfers the brake pads can be replaced for about $40 in about 30-45 minutes per set. Every level of enthusiast should be able to examine if there needs to be brake pad replacement whether or not they do the actual labor. (for your own piece of mind) Mercedes Benz has one of the best engineered braking systems out there.

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1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T