2017 Mazda CX5 rear electric Brake piston rebuild.

I screwed up and didn't put my wife's mazda cx5 into maintenance mode before attempting the rear brakes. The piston completely wound off the shaft and the tiny c clip was found floating inside the piston assembly. This is the rebuild, MAKE SURE YOU PUT THE CX5 INTO MAINTENANCE MODE before you do the rear brakes so you don't have to rethread the piston! The hardest part was getting the c clip back onto the shaft and carefully winding it back on the piston assembly. The other hard part is getting the rubber skirt back on the piston and getting it seated.
You can also compress the brake piston without being in maintenance mode but I would not recommend it. You will have to remove the brake motor to accomplish this.

[@thebrhinocerous]

Thank you for making this video…I could have figured it out eventually, but that little spiral clip that comes off when the piston unscrews threw me for a loop. This saved me.