Originally Posted by FAF
If the lever comes back to the bar , there are only three assumptions to be made, the pistons have been pushed back by "knock back" from warped or floaty rotors , or there is air in the system or a leak...period.
Brake fade is when the pads give up , not when the lever gives up.
Ok... I'll bite. Please explain how this works out with my situation.
1) After a few laps, My brakes deteriorate to the point where they will come all the way back to the bar, even on the furthest out adjustment on the lever, when I try to use maximum braking force. It almost feels like air in the lines (almost like freeplay in a clutch...) but.....
2)I come into the pits, change NOTHING BUT MY PADS, not even remove the calipers from the bike, and go out and ride at the same pace as before..... and now I have far more lever pull... I can get maximum braking and still have 3/4" pull before the lever hits the bar.
3)I come back in, just for the hell of it, and put the old pads back in. after 2-3 laps, problem comes right back. Seems pretty narrowed down to me (or I should say for me, in this case).
Rotors are true, and there's no way they're floating enough to knock the pads back..... no violent bumps, no headshake, very little time between stops, etc. I'm of a mechanics' mind about this too.... I can't find a simple answer for why this is. Wear on the pads -should not- have an effect and the range of motion in a perfect system.... but that is THE ONLY variable that I had to change to fix the problem. Mind you, the brakes behave perfectly when they are at most street operating temperatures... regardless of nominal pad wear.
I'd love to know why...