There has a rare things about my 4 pistons break caliper. after I detach it, there appear two big pistons and two small pistons.

Does anyone in here know what is this. Actually I could not repair the kit now. Please help!

 

That is very strange. All 4 pistons in the 4 piston caliper are the same from the factory.

What year RX-7?

And can you post a picture of these calipers?

 

Let me get a pic today. But looks like the previous owner change to Type RS brake. This is killing me and could not get repair part from US

Front pistons - Leading 33.9 mm, Trailing 38.1 mm
Front disk diameter - 314 mm

 

Yep, FD RS/RZ brakes are different. What is the problem though? Parts are mostly available.

 

Actually could not locate a repair kit. Any advice?