Need some more help with brakes
I posted another thread about a week ago but it has died so I thought I would try a new one. There's a fall festival this weekend that I would really like to ride in.
On my last ride, I lost all my brakes, as in the lever went to the handlebar and didnt stop. I got home and realized fluid was pumping from the upper reservoir to the foot brake reservoir and vice versa when I pumped either brake. I replaced all pads and my rear caliper, and it didnt help. Fluid is still pumping between the two reservoirs and I have no resistance at the levers. I agreed with the advice that I got here, in that the only place the fluid from the upper and lower systems meet is at the rear caliper. So I'm wondering if I could have gotten a bad caliper, or if a bad master cylinder could cause the same symptoms? I am removing the masters right now to try visually inspecting them but would love some advice on what could cause this. I have bled the brakes with a mighty vac, and even tried a zip tie on the foot brake overnight to get any air out. The brakes bleed fine, and they do grab when I squeeze the lever, just not enough to provide resistance at the lever. I would think that SOME resistance should be there if everything was working properly but I still had air in the system. I also hear a bubbly sound in the rear caliper when I push the foot brake. Its faint, but I hear something in there whether its air or just fluid moving.