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If your 2004 Mazda 6 is like my 2004 Mazda 3s, the only way to retract the rear piston is to set the parking brake. Then either turn with pliers or depress with c-clamp until fully compressed. Make sure to turn the cap of reservoir off to make compressing easier. And of course, remember to tighten again after completing brake work. Disregard all of the other advice being given to turn hex screws and the such. These components don't exist on newer mazdas. Good Luck! Galdekot

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Q: Do you have to depress the caliper piston back or turn it on rear brakes for a 2004 Mazda 6?
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