From wear and tear or excessive use,  BMW's clutch components  will start to not work properly.  The purpose of this hose is to send fluid to your clutch, and it also works with your clutch salve cylinder. The fluid this hose is carrying is released when you press the pedal, which allows you to move the clutch in a smooth manner. What can happen over time is that the hose can become damaged (a hole, crack, leak), it may become kinked since it is flexible, or even compressed. Any of these issues will cause it to work improperly as it won't be able to carry the fluid along. Given that there is no set maintenance/service schedule for this clutch hose you need to be aware of any possible problem. 
 
If you need to replace it, we have this Genuine Clutch hose in stock and ready to ship!