Author Topic: How to guide: 308mm brake conversion guide  (Read 54471 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 :)
M&R

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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Offline GreddRob

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Re: How to guide: 308mm brake conversion guide
« Reply #15 on: September 09, 2010, 21:01:07 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 ;)
They wont do Dave, A mate just tried that yesterday, They are total wrong
Look at his thread on B&G
M&R

Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #16 on: September 09, 2010, 21:53:17 PM »
Cheers Gav

Meriva discs will work a lot of people use them, not sure which Meriva but some use 4x100 280mm discs that are fine. Not quite as big as the 288's but all that means is you don't gear a wear lip on the edge of the discs.
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Offline GreddRob

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Re: How to guide: 308mm brake conversion guide
« Reply #17 on: September 09, 2010, 22:25:54 PM »
[quote author=Bad Kid
M&R

Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #18 on: September 10, 2010, 08:50:13 AM »
Mate has the late turbo calipers Ben, and just got the meriva 280 discs, said they wont fit, well the pad sticks way out over the edge

Thats how people run them mate. Honest to god.

I wouldn't be typing this if I had any doubt as it's obviously quite an important thing to be right on! lol
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Offline GreddRob

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Re: How to guide: 308mm brake conversion guide
« Reply #19 on: September 10, 2010, 19:19:18 PM »

[quote author=Bad Kid
M&R

Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #20 on: September 13, 2010, 19:37:06 PM »
I was thinking about converting C class AMG 316 mm discs or bigger ones onto my Cally, would it work?

Thinking of getting big brakes this way as a cheaper alternative.
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Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #21 on: September 14, 2010, 08:54:26 AM »
I was thinking about converting C class AMG 316 mm discs or bigger ones onto my Cally, would it work?

Thinking of getting big brakes this way as a cheaper alternative.

They have to be the right thickness, offset and stud pattern... even then they wouldn't work with any direct-fit Vauxhall caliper due to the size
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Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #22 on: September 14, 2010, 09:23:01 AM »
[quote author=Bad Kid
Memorable quotes: " 19 people in a cave made NORAD stand down ".

Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #23 on: September 18, 2010, 15:52:42 PM »
I had a second look, came across the XYZ big brake kits, think it's a good deal, as it's just a bolt on kit :)
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Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #24 on: September 18, 2010, 16:52:07 PM »
I had a second look, came across the XYZ big brake kits, think it's a good deal, as it's just a bolt on kit :)

Do you have a link mate>?
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Offline GreddRob

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Re: How to guide: 308mm brake conversion guide
« Reply #25 on: September 18, 2010, 17:15:19 PM »
There the same as Ksport and d2 brakes ben, Here is a write up on them
I am in the car parts(especially tuning) wholesale business. We are the exclusive EBC and Goodridge dealers in Romania and we also are official dealers for Powerflex, Bilstein, Tarox, and AP. As you can see we are accustomed with only serious suppliers.
I am writing this article hoping that no one will have the same bad luck as we did.
Because I received a lot of advertising emails from XYZ, I decided to give XYZ a try because I needed a suspension that was only available from them. I ordered 4 suspensions and a brake kit. The delivery time was supposed to be 7-10 days but they didnt respected it and the order was ready for dispatch after 21 days!!!. One of the suspensions did not fit and one of the brake kits came with the wrong bolt pattern.

I wrote to my sales agent and after sending pictures and making a lot of measurements during a whole week, she gave me the solution: the return of the items is not accepted because is not their fault they did not fit. The only argument they had was:
M&R

Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #26 on: September 18, 2010, 17:20:41 PM »
@ Ben: Rob..
@ Rob: Thanks for informing about that...  :) I didn't order any big brake kit yet, can you supply a good kit?
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Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #27 on: September 18, 2010, 19:52:31 PM »
There the same as Ksport and d2 brakes ben, Here is a write up on them
I am in the car parts(especially tuning) wholesale business. We are the exclusive EBC and Goodridge dealers in Romania and we also are official dealers for Powerflex, Bilstein, Tarox, and AP. As you can see we are accustomed with only serious suppliers.
I am writing this article hoping that no one will have the same bad luck as we did.
Because I received a lot of advertising emails from XYZ, I decided to give XYZ a try because I needed a suspension that was only available from them. I ordered 4 suspensions and a brake kit. The delivery time was supposed to be 7-10 days but they didnt respected it and the order was ready for dispatch after 21 days!!!. One of the suspensions did not fit and one of the brake kits came with the wrong bolt pattern.

I wrote to my sales agent and after sending pictures and making a lot of measurements during a whole week, she gave me the solution: the return of the items is not accepted because is not their fault they did not fit. The only argument they had was:
NURBURGRING CHALLENGE :-D

angus346

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Re: How to guide: 308mm brake conversion guide
« Reply #28 on: September 18, 2010, 20:16:59 PM »
on my V6, 1996, is it just a case of slapping bigger disc's on it and getting the new carriers?

Offline Bad Kid

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Re: How to guide: 308mm brake conversion guide
« Reply #29 on: September 18, 2010, 20:18:08 PM »
on my V6, 1996, is it just a case of slapping bigger disc's on it and getting the new carriers?

Yep
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Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #30 on: September 18, 2010, 21:13:07 PM »
[quote author=Bad Kid
Memorable quotes: " 19 people in a cave made NORAD stand down ".

Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #31 on: September 19, 2010, 10:45:29 AM »
I'm looking for a 4 x 100 bolt pattern, so i won't have to change the whole legs etc...

Isn't your Turbo 5x110? ???

angus346

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Re: How to guide: 308mm brake conversion guide
« Reply #32 on: September 19, 2010, 10:56:28 AM »
Isn't your Turbo 5x110? ???
i was thinking that considering they are same as V6, right?

Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #33 on: September 19, 2010, 11:05:02 AM »
i was thinking that considering they are same as V6, right?

Now who doesn't know :P

Turbo and V6 came with 5 stud due to the increased power/weight of the engines/gearboxes. Wheel bolts take the lateral weight of the car so more bolts means less stress per bolt :)

angus346

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Re: How to guide: 308mm brake conversion guide
« Reply #34 on: September 19, 2010, 11:06:24 AM »
Now who doesn't know :P

Turbo and V6 came with 5 stud due to the increased power/weight of the engines/gearboxes. Wheel bolts take the lateral weight of the car so more bolts means less stress per bolt :)
yes i know, the right was aimed at the OP :P. boy this sounds familiar ;D

Offline Gav

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Re: How to guide: 308mm brake conversion guide
« Reply #35 on: September 19, 2010, 11:07:31 AM »
:P

Unless Bart has a different Cally or has fitted a C20LET into a 2.0 N/A shell.

angus346

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Re: How to guide: 308mm brake conversion guide
« Reply #36 on: September 19, 2010, 11:13:15 AM »
Unless Bart has a different Cally or has fitted a C20LET into a 2.0 N/A shell.
would make perfect sense mate ;)

Offline Bart

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Re: How to guide: 308mm brake conversion guide
« Reply #37 on: September 19, 2010, 11:57:09 AM »
:P

Unless Bart has a different Cally or has fitted a C20LET into a 2.0 N/A shell.

Yes I have lol
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