This is the clutch master as used on almost every Mini ever made. While the part numbers have changed over the years, the shape, size and function has been the same until recently. The old style "bean can" master cylinder (pictured) is often not available being replaced with a plastic-bodied master. THESE NEW PLASTIC MASTER CYLINDERS WILL WORK IN ALL MINIS!
The master cylinder is the heart of any hydraulic system, and the hardest to troubleshoot. A pedal that can be slowly pushed to the floor indicated the master cylinder is worn. Fluid dripping off either the brake or clutch pedal is a sure sign that the respective master cylinder is leaking. Only one (single line) brake master and one clutch master are currently available, but they will fit any year Mini. Brake and clutch masters look similar, but they are NOT interchangable because they're different internally.