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The only way you could attempt to shorten the lever stroke in these brakes it to highly pressurise the system. Close the bleed port at the lever and forcefully inject fluid at the caliper. The inward pressure will force the pistons out a little bit closer to the rotor."
You can't pressurize the system. You can
- get all the air out
- use a smaller bleed block
Which has the same effect as pushing in more fluid with the normal sized bleed block.
- get all the air out
Howard-
use a smaller bleed block
This was the solution I was going for. I even found a guy selling custom printed bleed blocks that were, say, 1% smaller than stock Shimano ones for just this problem.
If people are making custom parts for an issue, you can be pretty sure it's not a mechanic's problem.
http://road.cc/content/forum/177528-shimano-r785-discs-lots-travel
hippy
"Lever stroke (assuming the brake is properly bled) is a function of the ratio between master cylinder (brake lever) and slave cylinder (caliper) volume. A small master:large slave ratio means that a relatively small amount of fluid is displaced from the master cylinder, so there's a smaller movement at the slave cylinder = longer lever stroke but excellent modulation. A large master:small slave ratio gives high fluid displacement, for a sharp response but at the expense of controllability.
The only way you could attempt to shorten the lever stroke in these brakes it to highly pressurise the system. Close the bleed port at the lever and forcefully inject fluid at the caliper. The inward pressure will force the pistons out a little bit closer to the rotor."