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Luddite · 21-06-2019, 08:43 AM

Master cylinder it is then. If there's any corrosion in the bore, then it will tend to compress the plastic sleeve that the piston slides in and so restrict its movement.

If you're of a curious nature like me, you might want to strip down the old master cylinder to see if you can positively identify the problem and this is a useful article showing the disassembly process http://www.atomicalex.com/?p=139

The master in the pictures is the rear exit model whereas ours is side exit but I think all the internals should be the same. The problem you'll have, if the piston is stuck, is that you can't easily drift it out as they advise because the exit isn't at the end, it's at 90°.

If you wanted to refurbish it, repair kits are available, not from Brembo or Ducati of course - that would be too easy - but from BMW or KTM. I think this is the kit you'd need https://www.motorworks.co.uk/vlive/S...T=6&Q=BRA36241

Hopefully you'll soon have a fully functioning rear brake again, Ryan, and I'd be interested to know what you find if you do strip down the old cylinder.

21-06-2019, 08:43 AM	#23
Luddite Registered User Join Date: Aug 2011 Location: Southampton Bike: M1100evo Posts: 2,465	Master cylinder it is then. If there's any corrosion in the bore, then it will tend to compress the plastic sleeve that the piston slides in and so restrict its movement. If you're of a curious nature like me, you might want to strip down the old master cylinder to see if you can positively identify the problem and this is a useful article showing the disassembly process http://www.atomicalex.com/?p=139 The master in the pictures is the rear exit model whereas ours is side exit but I think all the internals should be the same. The problem you'll have, if the piston is stuck, is that you can't easily drift it out as they advise because the exit isn't at the end, it's at 90°. If you wanted to refurbish it, repair kits are available, not from Brembo or Ducati of course - that would be too easy - but from BMW or KTM. I think this is the kit you'd need https://www.motorworks.co.uk/vlive/S...T=6&Q=BRA36241 Hopefully you'll soon have a fully functioning rear brake again, Ryan, and I'd be interested to know what you find if you do strip down the old cylinder.