When peoples TPAs break they usually just stop turning. There is no way that the TPA would have any effect on the lever movement if you don't touch it, it has to be a split hose, and you're not putting it simply at all you're using shit english. "The lever short pull a little bit, for the brake to then lock." That doesn't make any sense. Right I can't even understand your post to be honest your english is shit. "So if the TPA is jammed, it may not have proper control of the pressure on the fluid, and over time create the same effect as turning the wheel to minus." Not true at all, if the TPA is jammed, then it's jammed, it doesn't move, it wont change the "pressure" of the fluid at all, it just jams. If your TPA is staying in the same place for the WHOLE ride, and the lever is slowly needing to be pulled further, then you have a leak, end of story.