Classic Mini Cooper S brake rotor 7.5 inch diameter

If your Mini still have 10" wheels then you have the 7.5" rotors. see: https://www.minimania.com/part/21A1265/Classic-Mini-Cooper-S-Brake-Rotor-75-Inch-Diameter   and the pads https://www.minimania.com/part/GBP103/Classic-Mini-Brake-Pad-Set-For-Cooper-S-75-Disc

If your Mini has 12" or 13" wheels I would suggest that you measure your existing brake rotors, they will be either 8.4" or 7.5" as listed above. If they are the 8.4" then this is what you need: https://www.minimania.com/part/MMKT0502/Classic-Mini-84-Brake-Rotors-And-Pads-Kit

As for the rear brake drums- all Mini can use the 7" brake drum.  The only difference is that some models have a spacer built into them. The ones with the spacer simply require longer studs. https://www.minimania.com/part/21A22/Classic-Mini-Brake-Drum-7-Diameter   or  https://www.minimania.com/part/21A1279/Classic-Mini-Brake-Drum-With-1-Built-In-Spacer
    The stock 8.4" rotors that you probably have are actually a very good system and is most likely all you would need unless you are planning on real performance upgrades.  We offer a couple of options: https://www.minimania.com/part/GS126152/Classic-Mini-Brake-4-Pot-Calipers-For-84-Standard-Rotors  or even higher-end options would be: https://www.minimania.com/part/MT310000-BK/Austin-Mini-Super-Brake-Kit-With-94-Brake-Rotors
We also offer a rear disc brake option but in my mind it is a waste of money as the rear of the car can not do much braking anyway: https://www.minimania.com/part/KAD003/Classic-Mini-Kad-Rear-Disc-Brake-Conversion-Kit

Suspension kit: https://www.minimania.com/part/MSSK3014/Classic-Austin-Mini-Ultimate-Suspension-Geometry-Kit and https://www.minimania.com/part/MMKT0910/Classic-Austin-Mini-Ultra-Street-Comfort-Suspension-Upgrade-Kit

Mini Mania Tech Team

The Classic Mini Parts and Accessories Experts