Topic: Is this clean enough? (Brakes)

[samfig]

While I'm waiting for a part I decided to tackle these sticky brakes (the pad wasn't fully retracting into the brake housing) and wanted to get the collectives opinion on how clean this should be.
Thoughts?
What tools would you tackle this with (Dremel, hone, etc.)?

[samfig]

Some more angles.

[Stev-o]

Looks clean, is there anything in the groove?  Yes, I use a Dremel and also a dental pick-type tool to clean that groove.

The piston should slide in/out fairly easy but with just slight resistance.  Install a new seal.

And be sure your brake pad doesnt have any paint on the metal side to allow resistance.

Edit:  and either polish the exterior or spray a fresh coat of caliper paint while you are at it!

[Progas]

I vapor blast mine, it looks like new then!!

[bryanj]

Forget the dremel in the groove it just polishes the crap, use a pointed pick for the corners and a bent small screwdriver for the bottom DO NOT remove any metal as the groove is shaped not square.

[samfig]

What grit sandpaper would be too coarse to run through this?
I've got some 600 paper and then a 320 for the dremel.  As for a picks, I'll try scratching off the crud.
From what you all can see in the pictures, are the different tones of grey actually material that needs to be removed or is that just a function of time and no need to worry about it?

[bryanj]

You only clean the groove, the hole the pad sits in and the bit above the groove to the pad area.
Just needs to be clean with no corrosion, make sure piston slides free before fitting seal

[jonda500]

don't run sandpaper through it! I used a scotch brite scourer and brake fluid to clean mine
John