Is there any difference between regular rear drum brakes and those found a disc brake Mini?

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1970 Mini Deluxe - 1275, Weber, Clive 346 cam, MS 4-pot slotted discs, Megajolt ignition Now with new improved Mambas... almost on the road
1966 Van with Traveller rear seat conversion
2008 Prado GXL
All in various states of repair...

There are really only 3 different type drums, they are all same dimensions inside though (7" bore) and take the same brake shoes, 1-1/4" wide on rear..

Flat drums- used on all Minis with 3-1/2" wide rims, including 997-998 Cooper and Clubby.

1" spacered drums- used on Cooper S, Clubman GT and Clubby S.

3/4" spacered drums- used on big wheel Mokes.

Note the Cooper S and Clubby S drums have all the same dimensions, but the Clubby S one has a plain bore in the hub where the Cooper S/GT is cast a fluted shape. Both these drums fit the same...

Note if using spacered drums you need the longer wheel studs...

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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.

The slave cylinders on the rear of a disc braked car are smaller than on a drum front, to prevent the rears from locking. Cooper S rear cylinders are ⁵⁄₈" IIRC, while it's common to find ¾" slaves on the rear of a drum braked car.

I'm not sure there's any difference in the drum width...

(Hi from Kingsville, btw )

--s

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Simon

The adventures of an owner builder in the Tallarook Ranges

S and GT rear wheel cylinders are 5/8" diameter.
It's a good idea to fit these to any drum braked Mini when you fit S front discs or bigger.
Getting sideways on the freeway at 110 cliks is not funny.... as I found out once.

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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.

Yeah, I'm replacing drums with 4-pot 7.5" discs in a few weeks.. going to see how we go with the ¾" rears before swapping them

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Simon

The adventures of an owner builder in the Tallarook Ranges