DaveB

FWIW are you sure it's only the piston causing the caliper to stick? I've had this before and found the slider pins to be a contributing factor also. Suggest giving them the same treatment you gave the piston to maximise the success of your work.

Hope that helps.

markforrester99

I know some aftermarket big brake companies used aluminium pistons but i would of thought they would need to be a special grade of aluminium. Also wouldn't the aluminium conduct heat better than the stainless which will in turn put more heat in to the hydraulics which isn't a good thing for brake fade or the rubber seals. Ideally some calculations should also be done on the oem piston strength and how much thicker the aluminium one should be to withstand the high pressures. We are talking 1000's of PSI here and a failure doesn't bare thinking about.

AndyL

Also, the coefficient of expansion of aluminium is around twice that of steel, so an aluminium piston in a steel housing may well jam if the brakes got hot, so you would need to calculate the clearances between the two carefully. When they were cold, you would have a small clearance, and when hot a smaller one. Not sure how the simple seal that is used would cope with this.

Si2k

Wildwood use stainless pistons. They aren't that heavy anyway and aluminium oxide isn't known for its friction ability.

Sliders are fine as I give them special attention and re grease ever pad change. Piston was jammed solid. All my bodyweight on a half metre bar wasn't shifting it

Carbon S2K

People check out Godspeed brakes who will make you stainless steel pistons that will never rust,job done

Toms1989

Once they're passed what the op has done, Just get recon ones from AMK and be done with it... 2 years warranty and sourced for less than 60 nuggets each