Brake identification

[millworm]

I bought these from an astra f 1.6 16v auto the other day and i think they're 236 x 20 but not 100% cheers guys

http://i271.photobucket.com/albums/jj141/millworm95/C06C34C8-5131-4095-8EE4-7A0180CD5C99_zpsnz7xpzdq.jpg (http://s271.photobucket.com/user/millworm95/media/C06C34C8-5131-4095-8EE4-7A0180CD5C99_zpsnz7xpzdq.jpg.html)

[Novasport]

I am not sure but they look like 256x24. The piston size & disc width are usually cast into the body. 236x20mm calipers have 48/20 for 48mm piston and 20mm disc width. That one has 52-24

[Novasport]

These are my 256x24mm brake calipers which match yours, so that confirms it...

http://img.photobucket.com/albums/v305/NovaSport/20140619_195531_zpsf2943e05.jpg (http://smg.photobucket.com/user/NovaSport/media/20140619_195531_zpsf2943e05.jpg.html)

[BRoadGhost]

Were those expensive new?