Deceased 02/10/2010 - R.I.P.
Ducati Corse
Posts: 3,170
Join Date: Feb 2002
Location: Darlington, Co. Durham
Mood: NGRRC Minitwins champion 2007
As I said...the brake master cylinder gets hot - it's mounted on the engine and it will soak heat. Granted I thought it was his race bike cos he mentioned track, nonetheless, the cause is likely to be the same. Heat from the motor....if you have air or water vapour in hydraulic fluid then this will exacerbate the effects of the heat upon the fluid.
It is possible that the rear pot running hot might make it worse, but that much worse and you'd have pretty serious engine running probs tbh.
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