I pulled the caliper off and thought I might find a rebuild kit but I can't get the piston out. I heard it should slide out with compressed air but this thing doesn't budge. Should I just replace both of them or is it worth fixing?

Didn't mean to get ahead of myself but the passenger front was locked up. I am replacing the rubber also but found that I could not move the piston. I had replaced all the hardline 4 years ago but the braided was on back order. Sure enough by the time I put it back together and started driving it I got the braided in the next week.

 

you can get re manufactured front calipers from most auto parts store for under 20 bux each. cheaper then doing it yourself. not sure if there is a core charge.