Author Topic: How to guide: 308mm brake conversion guide  (Read 54472 times)

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Offline Bad Kid

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How to guide: 308mm brake conversion guide
« on: January 26, 2010, 22:37:27 PM »
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
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Offline DanSE4

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Re: How to guide: 308mm brake conversion guide
« Reply #1 on: January 26, 2010, 22:50:31 PM »
Spot on guide.
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Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #2 on: January 27, 2010, 15:02:26 PM »
Thanks Dan, could you move it to the right section please?

(or just make me a mod so I can do it, lol ;) )
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Offline DanSE4

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Re: How to guide: 308mm brake conversion guide
« Reply #3 on: February 03, 2010, 22:48:15 PM »
I would, but I can't.

Kind of tried but it wound up here ???

Think that one's for Admin :)
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Offline GreddRob

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Re: How to guide: 308mm brake conversion guide
« Reply #4 on: February 03, 2010, 23:30:03 PM »
I love guides like this, Fair play BAC.
Thanks :)
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Offline ricijs

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Re: How to guide: 308mm brake conversion guide
« Reply #5 on: September 09, 2010, 18:47:17 PM »
Can I use front brake calipers (calibra v6 with 284 mm brakes front) for rear axle (stock brake discs 270 mm with calipers 35 mm) with vectra gsi rear brake discs 286 mm??? Holes for brackets are the same!

Offline Phil.

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Re: How to guide: 308mm brake conversion guide
« Reply #6 on: September 09, 2010, 19:21:14 PM »
Nice one Ben!

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

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Re: How to guide: 308mm brake conversion guide
« Reply #7 on: September 09, 2010, 19:57:16 PM »
Nice one Ben!

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

Thanks mate
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Offline Phil.

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Re: How to guide: 308mm brake conversion guide
« Reply #8 on: September 09, 2010, 19:57:40 PM »
Identical calipers mate :)
Audi S4 2.7 Twin Turbo Avant, RS4 Turbo's + Intake, 2.5'' Turbo's Back Exhaust, Fully Rebuilt Cylinder Heads, RS4 Fuel Pump + Injectors, Coilovers, RS6 Seats, 18'' B6 Alloys, RS4 360mm Fronts, RS4 321mm vented rears, RS4 Spoiler, much more!

Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #9 on: September 09, 2010, 20:03:36 PM »
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.

Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #10 on: September 09, 2010, 20:05:44 PM »
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
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Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #11 on: September 09, 2010, 20:07:36 PM »
I would be very, very surprised if they fit under standard 15" alloys.

Would certainly knock any weights off lol

Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #12 on: September 09, 2010, 20:09:44 PM »
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
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Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #13 on: September 09, 2010, 20:20:07 PM »
I know that mate but this is the standard clearance.

I just thought you might be pushing it on 15"s and if you knew the minimum wheel size it could be helpful to anyone interested in the conversion. :)


Offline Dave

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Re: How to guide: 308mm brake conversion guide
« Reply #14 on: September 09, 2010, 20:56:45 PM »
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 ;)
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