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Did a bit of a service ready for hols - including checking out brakes and bleeding them.
Found the black rubber nipple thingy on top of master cylinder reservoir has a lump missing from it. Just behind the yellow filler cap in pic below.
Looks like some kind of little plunger thing under it. The hole meant that I couldn't pressurize the system for Easibleeding - (had to borrow the nearest right leg - belonging to 'tother half...)
So anyway - what's the black nipply thing do and has anyone got one knocking about??
Any dire consequences of it being in the present condition? Fluid spill and contamination being my best guesses so far...
 
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