Update on my Dragster RR rear brake: since MV expert re-bleed last May: still perfect. It is holding through very hot weather and some hard use.
Honestly I don't know for sure. I do know my mechanic removed the brake assembly and patiently bled it while flipped upside down. He really knows these bikes. Earlier in the year I had another mechanic replace the rear brake cylinder and bleed: did not last very long.Good to hear mate. Was this based on S/B 189 rev1?
Would be interesting to understand why the master cylinder was replaced.Honestly I don't know for sure. I do know my mechanic removed the brake assembly and patiently bled it while flipped upside down. He really knows these bikes. Earlier in the year I had another mechanic replace the rear brake cylinder and bleed: did not last very long.
A possibility that you had air trapped in the secondary side of the ABS unit - your symptoms would add up to that conclusion. Was your bike bled using SB 189 rev1? - so by a dealer in the last 2-3 months since the revised SB was released?I think it clearly show it's not the MC's fault. It's quite difficult to remove air completely from the system given it's lay out and geometry IMO. My unscientific theory is air gets trapped somewhere along the ABS system. And when it's activated and/or after some useage it gets back in the line somehow. I say this only after noticing my level going down (no leaks, not boiling away). Obviously in my case it was not bleed completely. Even though my pedal was firm. I've had no issues since.
Assume from your response that you are tied up with MV in some way? If our pitting (on a new M/C fitted under warranty 12 months ago) is not electrical in nature, then pray tell what is it?I think yours is an isolated case regarding damage to MC. I don't see this across the board as an issue. Nor do I believe there is phantom voltage causing the pitting.
Agree.ABS systems can be very difficult to bleed. Helps to have software that can "cycle" the pump.
On an MY19 bike? The fluid must have been in there less than two years. What would cause it to go rotten?Not much rubber inside the ABS unit....and those things are tested to live forever due to the massive liability concerns. That was likely just rotten fluid you had never gotten out off the system previously.