How can I tell which one for a 2003 R50? Original is still on the car, have not pulled it out yet.

 

Should see it on the toggle rack. What are you going to pull out?

 

Yes, there is a toggle switch wit ASC The 17-year-old Mini is new to me, and one of the first things I did was install new rotors and pads. But although it stops as it should, the brakes still feel mushy, so I'm thinking about replacing the master brake cylinder. The parts store offers 3 options: with AST, with DSC, or plain without either