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Unlike the front calipers which can be compressed using a C clamp, the rear pistons must be turned as they are compressed. If you look at the surface of the piston you should see two notches. You should use a rear caliber pistol tool which could cost about $70 (search Google and you'll find several). I was in a hurry and did not have such a tool so I used was a pair of needle nose pliers. It's a crude solution but effective. Be mindful though...it takes a significant amount of force to compress and turn the piston at the same time. My advice would be to wear thick gloves. Also, be careful that the pliers don't slip off the piston head and tear the boot. Visit this website for more info http://www.audiworld.com/tech/wheel24.shtml

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Q: How do you compress the rear caliper piston on a 2002 Audi A6 Quattro?
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