Checking my bike over the weekend before the Alton ride and I discovered a collection of fluid in the right hand guide. Closer inspection revealed that there is damage around the sight glass and to the sight glass leading to this leak. Am I going to have to replace the whole brake unit or is it possible to replace just the top part of the reservoir body including the sight glass? I have no idea how this happened as my slow speed crash which lead to my broken hand was on the left side and it looks like something sharp and probably metal impacted the sight glass with no damage to the bar below and in front of it...very odd

Advice please...

Scott