Shaft brake leak

Donato Valente

Hallo gentlemen. 
I'm finding some red oil in the bilge. 
Anyway  hydraulic oil level not noticeably changed. 
Apparently the oil leak comes from the cilinder 
(Right side from the hole ?) as per picture. 
Apologize for the banal questions :
it is supposed to be a screw cap on the hole ? 
The leak can come from a seal ? 
Thanks for your help

Amel SM2000 #468
Now in Elba Island Italy

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