Our MCS started to leak clutch fluid from the slave. So, figured, that's easy...Having worked on numerous cars -- including currently freshening up a 84 911, it should be a 30 minute job.
Ordered the slave from rockauto, bench bled the slave, then took the 3 minutes to remove the slave from the car (including lifting the car).
Installed the slave (don't forget the random rubber bushing that could have easily been designed part of the clutch line), and began doing the normal bleed procedure that is done for virtually every hydraulic clutch known to man.
After an hour and a half of bleeding, could not get the clutch to function correctly.

Did some googling -- and the design of the slave is so dumb that it won't work unless you do a very specific bleed procedure.

For those uninitiated to the process, here's the proper way, despite being covered in a lot of other places:
1. build/buy contraption to compress new slave cylinder completely, cursing at the stupid design the entire time.
2. fill slave with fluid
3. lift car up and secure
4. remove splash guard
5. remove 2 bolts holding slave to gearbox using 10mm socket
6. put drip pain under car
7. pull retaining clip back using a pick (or whatever) on the clutch line
8. pull clutch line out
9. curse while the fluid drips everywhere while you search for the stupid tiny rubber grommet that goes on the end of the clutch line... could be on the clutch line, could be in the used slaved, could be on the ground, could be in the drip pan...
10. put grommet on clutch line, skinny side at the end
11. push clutch line onto new slave
12. curse more because you're covered in brake fluid
13. open bleeder, push pedal down, close bleeder, let up on clutch. Repeat until good
14. remove contraption from slave
15. install slave to gearbox
16. curse more.
17. reinstall splash guard
18. lower car and go test drive

Moral of the story -- Minis do not conform to normal standards of automotive industry. Do your research beforehand.

 

Amen brother. It was a PITA and something I hope I don't have to repeat.

 

I spent like ten minutes under there thinking I'd lost the little rubber thingy after three tries to get the hose latched to the new cylinder. Not fun. Moved all my tools out from under the car, looked all over the floor nearby, the whole time trying to keep one finger over the dripping end of the hose.

Of course, it was stuck inside the new slave. Good times.

 

I still had issues after all of this, and had to put a long stick on the clutch pedal (completely compressing it) and pushing the seat forwards so the stick stayed in that position over night. After a couple times of doing that, i got the last miniscule bits of air out of the line and the clutch pedal felt ok.