Identifying 3.0si brakes against 3.0 brakes?

E

Enigmatik

Member
Hi folks, does anyone know if there is an easy way to distinguish 3.0si v 3.0 brake set ups? Got a set from a breaker advertised as 2006 3.0. I asked if they had vin or reg but car already scrapped. Either way an upgrade from my 2006 2.5 standard set up. However just want to check before I have to buy both sets of front discs if there is a way to tell size from carriers etc. No rush as need to refurb them first.
 
The 3.0Si front discs are 325mm, the 3.0i ones are smaller - 300mm IIRC.
 
Is there a way to tell from the carrier or caliper? As the breakers doesn't have the car. The calipers have 57/25 on them and few other numbers.
 
57/25 = 3.0Si. 325mm discs
54/22 = 3.0i, 2.5Si. 300mm discs
54/22 = 2.5i, 2.2i, 2.0. 286mm discs

The first number is the diameter of the piston in mm
The second number is the thickness of the disc in mm
 
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