Need some tips on replacing a Bad Brake piston gasket - any ideas?

[Brainsprain]

I was trying to replace the rear brake pads. Looked like an easy fix. Well, not so fast. First, I noticed what I assume is a dust dirt gasket was deteriorated. I tried to turn the piston back into place. I couldn't do it. Questions:
1. Where and what do I buy the gasket replacement?
2. I may need to put more pressure on it. I do not think it came unthreaded, but it won't turn. A little CW but only a little. I've worked with it with WD 40 and Brake cleaner. Any ideas will help.
3. If I cannot get the piston back, can I put the pads back on so I can reinstall the caliper and drive it to the mechanic?

 

[Cosmo]

If you are using needle nose pliers to rotate the brake piston, that might be part of your problem

 

[Jetfixer]

You need to supply the model year for questions like this.
1. If this RT has the Brembo brakes (later model years) call your dealer and ask if part number 219800242 ($32.99) is correct. It's listed as a dust cover, but is a non-illustrated part in the online catalog.
2. Yes, try pushing very hard inward as you try to turn the piston back in. Usually after they start turning they start getting easier to turn.
3. In theory, yes you could, but, it may be very hard to get the caliper back on with the pads in place and no slack from not turning the piston back in.

 

[SpyderJerry]

Also, All Balls Racing has kits to rebuild the calipers. Go onto their site and they have a chat to help you.

 

[Brainsprain]

Thanks for your quick responses. I'll follow up.

 

[Snoking1127]

Thanks for your quick responses. I'll follow up.

It would help if you put 2017 RT in your sig line.

 

[BajaRon]

If the rear caliper piston has the 2 rotation attachment points, it doesn't matter what year or model you have. Everything from 2013 on is the same.