OK, here is my dilemma. Ever since switching from 160mm to 180mm disc on my rear brake (Shimano XT 775, using Shimano rotors), I am getting some crazy frame vibrations at hard braking....and I really mean crazy frame vibrations. I get the crazy high pitch squealing too, but that's just a nuisance in comparison to the vibrating frame during hard rear braking. It's so pronounced that it really affects the braking and suspension performance quality in the rear quite badly.
Did some digging in the brake forum and tried the most common/obvious recommended remedies. Changed the pads from Galfer to my old Shimano sintered pads, still the same problem. Took all rear brake parts off/apart, cleaned them and re-installed, still same issue. In the meantime I noticed that monolink had developed some play and replaced all 4 monolink bearings (which really needed replacement after 2 years of duty). But nope, that wasn't the culprit either.
Today, I took the 160mm Magura rotor off my hardtail and transferred it to the rear of my ML8 (can no longer use my Shimano 160 due too many mechanical warps...that's why I replaced it originally with a Shimano 180 coming from my DUC, which in turn got a 210 upgrade and works very nice on my DUC). I got this annoying high pitch squealing again, but at least the crazy vibration issue seems gone now....though I am still skeptical and will continue to monitor. Not to mention....I have no friggin' clue why this is happening.
Did anyone else have this kind of problem on their ML8 or anyone with any advice that will allow me to use my 180 rotor in the rear (which worked perfectly on the front)??
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