Technical Aluminum brake caliper pistons???

Anyone know if aluminum caliper pistons would be a bad idea? I need 8 pistons for a set of kelsey Hayes front calipers. I can turn my own out of aluminum I have laying around but I thinks the thermal expansion may make aluminum a bad material choice?
Thanks

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How much clearance is needed would be my concern.
But it might be worth a try.......

 

I would think that normal expansion and contraction would cause problems. Aluminum would expand and contract more than other metals

 

Too much heat transfer to the fluid. There is a reason racers use stainless pistons, or ceramic and even titanium.

 

Yes I think it ain't worth the savings. I'll order the ones from rock auto. Seems they are the only ones that offer them. At seven bucks each it isn't worth it to screw around with.

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I recently had the caliper on my bike apart to replace the O rings. it has an aluminum piston.

Some calipers have aluminum pistons and some don't. I can't give you a list of either or proper clearances but I do know that they come both ways.

 

Very common in race car calipers

 

I would think that aluminum pistons would be ok in aluminum calipers....same rate of expansion. As to heat transfer as long as you aren't road racing or oval track racing it shouldn't be an issue...but for $56 you just bolt them back together?..rock auto wins on this one!

 

@ppsi1216 .......love your avatar......one of my favorite movies.

 

Aluminum pistons need to be hard anodized and that has to be considered into the machining tolerances plus adds to the cost.