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Like Snowman recommends I use compressed air to pop out the piston , thats the easy part. After you get the interior of the caliper cleaned and install the seal ring and the dust boot (and its metal ring) how does one get the piston back in? For single piston calipers I have found that a little compressed air works wonders. I place the piston on top of the dust boot (make sure it is centered), place a piece of wood or metal between the piston and the other side of the caliper to prevent it from flying away and give a small puff of compressed air into the brake line fitting and the boot pops up around the piston which can then be pushed into the caliper bore.

 

I have done this many many times and this way I am sure that the dust boot is properly seated with the metal ring in the caliper.

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That is correst Jim get you a blow gun that has the rubber tip that is cone shaped. You dont need much air, the little portable air tank is enough. After one go with those rubber boots you will most likely want to exchange for rebuilt calipers next time.

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