I am having an issue with my gen 5 that seems to fit in with this chain of posts. My rear brake seizes when I use the rear brake pedal only. I can push on the rear brake lever 2-3 times and then the rear brake seizes. I can release the pressure by either bleeding a little fluid out of the LPCV (only PCV on the gen 5) or by bleeding a little fluid out of the center bleeder on the rear brake. Opening the more forward bleeder on the rear brake does not release the pads. I can manually push / release the SMC, feel the rear brake engage and release over and over without it locking up. The front lever seems to work the front brakes well but do not seem to do anything to the rear brakes.
I have rebuilt the rear caliper, it was in pretty good shape to begin with, replaced the rear pads and bled the system using this thread. Any thoughts before I just start changing rear lines PCV.......
So I realized that applying the front brake shouldn't do anything to the rear brakes unless the bike is moving via the secondary master cylinder.
After giving this some thought all I can think is that somehow rear master cylinder fluid is pushing through the secondary master cylinder, getting into the rear caliper center piston but because of the failure of or how the SMC is made that excess fluid cannot get back to the RMC. This would explain why the SMC seems to work fine but once seized by the rear petal I can free the rear wheel by bleeding fluid out of the rear center bleeder or the PCV. So I will start with rebuilding the SMC unless someone has a better suggestion.
I am having an issue with my gen 5 that seems to fit in with this chain of posts. My rear brake seizes when I use the rear brake pedal only. I can push on the rear brake lever 2-3 times and then the rear brake seizes. I can release the pressure by either bleeding a little fluid out of the LPCV (only PCV on the gen 5) or by bleeding a little fluid out of the center bleeder on the rear brake. Opening the more forward bleeder on the rear brake does not release the pads. I can manually push / release the SMC, feel the rear brake engage and release over and over without it locking up. The front lever seems to work the front brakes well but do not seem to do anything to the rear brakes. I have rebuilt the rear caliper, it was in pretty good shape to begin with, replaced the rear pads and bled the system using this thread. Any thoughts before I just start changing rear lines PCV....... So I realized that applying the front brake shouldn't do anything to the rear brakes unless the bike is moving via the secondary master cylinder. After giving this some thought all I can think is that somehow rear master cylinder fluid is pushing through the secondary master cylinder, getting into the rear caliper center piston but because of the failure of or how the SMC is made that excess fluid cannot get back to the RMC. This would explain why the SMC seems to work fine but once seized by the rear petal I can free the rear wheel by bleeding fluid out of the rear center bleeder or the PCV. So I will start with rebuilding the SMC unless someone has a better suggestion.