step bore master and pushrod

[Apogee]

Just because it's on the internet doesn't make it so. I think MP Brake may be exaggerating a little...1/8" of piston movement with a 3" piston would require .72" of 1.25" MC piston stroke...for each caliper. Somehow that doesn't sound like a good method to reduce pedal travel to me.

Using a feeler guage, I would say that the low-drag calipers retract the pistons about .010" when new. More than double what you call a regular caliper and significant in terms of the added volume requirement from the MC.



I'm sure you're already aware, but the S10 manual master has a 1.25" [31.75mm] primary piston bore while the power unit was slightly larger at 1.41" [36mm].

To answer your original question, it would appear that there is enough material to deepen the pushrod hole if you feel the need however I've only ever modified the pilot register diameter of the housings. I'm sure you could come up with a spacer to run with an extended pushrod in order to support it and make sure it couldn't drop out of the divot in the piston.