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Just thought I would share my recent experiences when suffering from intermittent overheating rear brake on my 2005 V11 Le Mans with 10000 miles. All appeared fine at the pedal so I suspected rear calliper which I inspected and cleaned, both pistons fine and moving nicely, test ride and still binding. Removed master cylinder which at first appeared fine but I decided to rebuild so ordered repair kit from motomecca. When the kit arrived the problem became obvious! The master cylinder piston was not returning fully due to a build up of alloy corrosion within the body of the master cylinder which was squeezing a nylon sleeve which the piston slides up and down in thereby causing pressure to be applied even when pedal not pressed. I have now rebuild the master cylinder and problem sorted. Just something to watch out for as this obviously happens over time. If you look inside the bottom of the cylinder where the push rod enters you will see the black coloured piston within the white nylon sleeve held in place by a circlip. The piston should return all the way back to the circlip, level with the bottom of the nylon sleeve. If not you probably have the same problem as me. Repair kit was about £20 including postage so probably worth doing next time you change fluid. Hope this helps someone else! Jez