Okay, put on your beer bottle bottom glasses, we're getting nerdy! This is of course my theory and thinking, I've never designed a braking system so I don't know if this is fact or fiction, but it kinda seems to check out. Though if you ask a 'world cup levele mechanic' on Pinkbike, the swing link does nothing. Anywho, hydraulic brakes are essentially a simple hydraulic machine. As per wiki's
article, this is the most important picture in the story (stolen and reuploaded due to the size of the original picture and keeping only the relevant part): That force...