Replacement piston for Shimano BR-MT520

[coarselanguagw]

I have a 4 pot shimano caliper, BR-MT520.
One of the larger ceramic pistons has cracked. I’ve pulled the caliper apart and have removed the piston.

Is there any way to get a replacement piston? I’ve seen some metallic pistons advertised on eBay but I’m not sure if they would fit these brakes.

Any advice?

 

[komdotkom]

I've got a dead Saint caliper with the same problem, let me know what size you need

 

[coarselanguagw]

I've got a dead Saint caliper with the same problem, let me know what size you need

My crappy calipers are showing that the piston should be around 17mm.

 

[The Duckmeister]

17mm would be right for the leading pair of pistons, the trailing pair are 15mm. These diameters are constant across all recent Shimano four-pot calipers, so all are interchangeable (if not exactly the same units).

 

[coarselanguagw]

I've got a dead Saint caliper with the same problem, let me know what size you need

Let me know if you need the small piston or the big piston.
I'm looking at getting a new SLX caliper to get back on the bike ASAP. But I am strongly considering getting these replacement pistons from Aliexpress .....here..... as they match the size I need and would ensure that my M520 caliper is not a total loss.

 

[komdotkom]

Hi mate, I replaced the Saint caliper years ago and it's been floating around the bottom of my tool box ever since. I tried to use Hope pistons but they were the wrong dimensions.
PM me your address and I'll post it to you.