Quote:
Originally Posted by Luddite
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Pedro has been having trouble with a soggy back brake on his M1200R.
He has solved it now though:
‘ stumped up for a new master cylinder and swapped it over and also fitted the Stalhbus nipple, low and behold I have a decent rear brake again, not ridden it yet (prob tomorrow) but the pedal has remained firm for a few days (normally goes a little mushy in a week).
but... omg, how flipping good was the new bleed nipple! System was bone dry, undo bleed nipple 1.5 turns to fully open the ball valve and use a vacuum pump to fill the system, took about two mins, close the nipple fully, pedal felt quite good. Onto “bleeding” it, open it half a turn so the ball valve is in play, pumped through a couple of reservoirs of fluid, close valve, pedal good and firm. Chuffing marvellous!!
I pulled the old cylinder apart to see if there was anything obvious wrong with it but nothing other than some uneven wear in the bore from the naked eye. I still think it was letting air in, perhaps via the reservoir connection but not sure.’