I have a few sets of Cooper 7" disc brakes and i was wondering if the 7.5" Cooper S rotors will fit on the hubs or are they completly different. I suppose the calipers would be different too. The 7" rotors I have a quite worn i think and I thought I could upgrade to 7.5 rotors. Any advice would be appreciated.
Steve.

Yes S discs will fit, all mini disc brake hubs are the same, you can easily update to S brakes by changing over the disc,caliper & drive flange.

Doogie

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Thanks Doogie, does this mean i could put 8.4" rotors on, if i am going to upgrade i may as well go all the way.
Steve.

Sure can, i might even have a set of caliper & discs lying around here, if you need some.

Doogie

_________________
I won Hay once, here's the pic to prove it..


Hay, it's not about the car, it's not about the venue, it's about the people that come here. Peter Dwyer, Mayor of Hay NSW.

I know someone here in Wagga looking for a pair of Cooper rotors.

Bromley, I think one set of rotors is no good, I will have a close look. I may still use the other set if they are ok. I will get back to you about that. Does anyone know how thin is too thin for the Cooper rotors.
Steve.

Just a quick barrier perhaps,

The CV's for the cooper discs are the same as drum brakes, the CV's that are needed for S brakes or 8.4's i think are different.

Hope this helps. Check it out though

Brad

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Steve,
When I got my rotors machined the brake people had a book with all the widths. Maybe try calling a brake place if you get no luck on here. I am also digging up a photo of the rotors taken out of my mates car. They were wafer thin, I snapped one in half with my hands like a biscuit!

I think around 8.5mm is the minimum for a mini brake dics, but don't qoute me on it

Doogie

_________________
I won Hay once, here's the pic to prove it..


Hay, it's not about the car, it's not about the venue, it's about the people that come here. Peter Dwyer, Mayor of Hay NSW.

Cooper 997 & 998 rotors are only 1/4" (6.35mm) thick when new. I believe minimum limit is 5mm.
Sure it's thin but they still do work, haha.

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are cooper drive flanges and cooper s drive flanges the same? apart from the cv diameter?

if so couldnt you use 7'' flanges with drum CVs with cooper s discs and calipers?

that makes sence to me as the drive flange on cooper discs looks the same as cooper s to me, and would make things a hell of alot cheaper

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No, unfortunately they are totally different. Cooper 997 & 998 used the drum type CV, the Cooper drive flange looks like the offspring of an S and a drum one.

ps I might have a spare s/h S one, I'll look.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.