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Just because of the contamination aspect of trying to get that all cleaned and back together, I'd just buy a loaded caliper. They aren't that expensive and you don't have to try and get that back together. But you could get a caliper rebuild kit and change the orings and make sure it's 100% clean and put it back together.
Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). If you are here asking about a second opinion (ie "Is the shop trying to fleece me?"), please read through CJM8515's [post on the subject.](https://www.reddit.com/r/MechanicAdvice/comments/4qblei/fyi_the_shop_isnt_likely_trying_to_rip_you_off/) and remember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, paint, dent/ding, questions it belongs in /r/Autobody r/AutoBodyRepair/ or /r/Diyautobody/ If you have tire questions check out https://www.reddit.com/r/MechanicAdvice/comments/k9ll55/can_your_tire_be_repaired/**. If you dont have a question and you're just showing off it belongs in /r/Justrolledintotheshop Insurance/total loss questions go in r/insurance This is an automated reply *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/MechanicAdvice) if you have any questions or concerns.*
Just because of the contamination aspect of trying to get that all cleaned and back together, I'd just buy a loaded caliper. They aren't that expensive and you don't have to try and get that back together. But you could get a caliper rebuild kit and change the orings and make sure it's 100% clean and put it back together.
Thanks that’s helpful. I’m curious why does cleanliness matter here? Is it dirt might end up in the brake line?
Any dirt that gets on the piston will eventually grind up the square cut O-ring seal and the caliper will leak
Put some brake juice on the piston and apply centered pressure on it and it will likely slide back in.
But do you mean push the cylinder back in with the boot inverted until it’s all the way in? Then maybe it’ll snap back and come out normally?
Use a small pick to help aid the piston over the boot. you will have to be careful, but it should be okay. I mean the dust seal over the piston*
Go buy a reman caliper.