Was attempting to replace all 4 rotors on my wifes 2012 A4 Avant. I had purchased the replacement 21MM caliper carrier bolts. Did not realize that the caliper carrier bolts are NOT the same size on the front as they are on the back. The rear caliper carrier bolts are longer and if I recall slightly smaller..maybe 18mm(assuming due to the electro mag parking brake etc). Does anyone have the specs on the bolt size and where I can buy them as you are supposed to replace those?
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