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Old Jul 28th, 2014, 02:55 PM
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England 294mm Disc upgrade on Cooper SD 63 plate

Hi Guys

I am new to the forum and I am looking for some clear information as I am having some trouble with mini themselves

Basically long story short I have wore out my standard front brakes (discs & Pads) within 11,000 mile so mini have said why not upgrade to the 294mm drilled and ventilated discs.

They have come to fit them and they don't fit which I told them they wouldn't without other changes.

They are now saying to fit these discs i would need all the JCW kit and also larger wheels 18s instead of 17s. As far as i was aware the JCW kit was 316mm disc so i assumed this was an upgrade for the cooper s.

If i was to fit the 294mm discs to my cooper sd with 17" wheels what other parts would be needed?

Cheers
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Old Jul 28th, 2014, 09:53 PM
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I did this change on my SD. You need:
- 294mm discs - can be drilled though I think that's more fashion than function;
- brake caliper carriers from an S (294mm discs), not a Cooper/SD (280mm discs);
- new S pads;
- a new brake wear sensor.

That's it, the total. These will fit under most 16" wheels - see this very site's Wheel FAQ for which OEM wheels fit.

The callipers remain the same and are not even disconnected. The dealer labour cost to make this change should be no more than for disc and pad replacement - there is absolutely no more work to do this, as the caliper carriers are removed during a disc change.

The end result is safe, in that you no longer get brake fade if you drive hard. I wouldn't say the 294mm brakes feel any better, they just don't suffer from fade.

If you haven't been suffering from fade (the brakes working poorly after big stops from high speed) and you just use the brakes a lot, so wear them out quickly, I'm not sure that the 294mm discs will be a big benefit to you.

My pictorial guide of dong this conversion yourself is attached - due to forum limitations, this is a low-res version but that doesn't have much effect.
Attached Files
File Type: pdf Retrofit_R56_Cooper_S_Brakes_lores.pdf (343.0 KB, 17 views)
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Old Jul 29th, 2014, 08:34 AM
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Thats perfect, just what i thought

mini where trying to make me buy a new set of 18" wheels & tyres to fit them all

Thanks for the help Angib
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