308mm brakes on a Calibra

Which calipers to use
Use Vectra B calipers off any Vectra with 288mm brakes (eg a V6) or from a 2.6 GSi. You CANNOT use any of the other calipers from other Vauxhalls with 308mm discs, for example the Zafira GSi or Mk4 Astra Z20LET as the mounting holes are different!

Which carriers to use
a) LMF conversion carriers (below)
b) Standard GM Vectra B 2.6 GSi carriers

Both of the above options will bolt direct to any Calibra leg and let you clear 308mm discs, with a caliper listed above.



Above: LMF 308mm conversion carriers

Discs
You can use any Vauxhall 308mm discs in your conversion, either standard Vauxhall ones, pattern parts or aftermarket ones (eg Mtec, EBC). You can buy them listed for any of the following Vectra B 2.6 GSi, Zafira GSi, Astra Mk4 Coupe Turbo / GSi. They are all the same. Note you will need to redrill them to 4-stud for a 4-stud Calibra.


Above: 308mm discs listed for a Vectra 2.6 GSi. Vectra 288mm calipers, LMF conversion carriers... all on a Calibra leg.

Brake lines
All Calibra brake lines will fit directly onto a Vectra caliper, no swap needed

Additional info - important
Unless you have a Calibra equipped with 288mm brakes (late turbo/V6) - you may have to grind your hub down by a few mm to fit the 308mm disc on. If you do have a late turbo/v6, this is not needed.


Above: A late hub which does not need grinding.

See the full conversion on my project thread
http://www.clubcalibra.com/index.php?topic=25662.0

Thanks Dan, could you move it to the right section please?

(or just make me a mod so I can do it, lol )

I love guides like this, Fair play BAC.
Thanks

Nice one Ben!

Only thing I will say is the late Calibra V6/Turbo Calipers can be used as well as the Vectra ones

Identical calipers mate

What is the minimum wheel size for this conversion? 16"? Just wondered as any V6 owner will tell you there is minimum caliper clearance as it is.

16s are fine I've had a 16" alloy on mine

15" might even be possible

I would be very, very surprised if they fit under standard 15" alloys.

Would certainly knock any weights off lol

It's not uncommon for brakes to go under 2" smaller wheels than standard. 256mm which came on some cars with 16" alloys will fit under 14s for example

Let me just add that, to some of the more novice amongst us, instead of re-drilling the discs you mentioned to 4 stud, just buy Meriva 1.7 cdti discs, as they are 4stud, and big enough to cater for the application

Top guide Ben