The shop is determining the problem, not me, and they say it's the rotors. They are replacing them for free today since it's only been 2 months, so I'd guess they're pretty sure it's the rotors. Otherwise, they'd not replace them for free. As for brand, I don't know what they're using. I'll be sure to ask.

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1980 240D 4-spd 185K (The Tooter)