Mini Cooper R50 Brake Master Cylinder Replacement

I've had a few instances now where the brake pedal once in a while will need to go closer to the floor to engage the brakes. immediately after that it's al fine again. Since I'm unsure where the issue is after looking for leaks in the system I've gone with a gut call to replace the brake master cylinder. This job really only took me about 2 hours end to end and is easily doable with very little problems other than cleaning up all the fluid I spilled.