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I bought a remanned front brake caliper from advance auto parts and the seals and pistons are out about 3/8 inch. Should the seals and pistons be flush with the caliper body? [I'm inclined to say YES! The new rotors and pads are thick and the caliper should give clearance for those parts.] Currently one of the pistons is touching the rattle shield or whatever you call it.

I'm going to swap this caliper because I rebuilt a caliper before for a ranger and got everything nice and flush. I think this is just a job poorly done. Am I wrong?

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Your picture does not show enough detail, but I think that the item you call the seal is actually the rubber dust cover and the pressure seals are further back on the piston.

Also you should be able to push the pistons back flush with the body - take care some pistons need to be rotated either clockwise or anticlock due to the mechanism inside, the pistons only need to go back sufficiently to allow new pads to be fitted.

Solar Mike
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