[jhv48]

Ok, now I get it. You did NOT replace the master cylinder. You did replace the slave and the fluid reservoir.

That makes things a little easier to diagnose. If your slaves (either one) are only moving 7/8 of an inch when compressed, then you have some residual air in the system, or your master cylinder developed an internal leak (not very likely). Did you let all the fluid drain from the master cylinder when you changed the slave and reservoir? If so, then you need to bleed the master cylinder also.

When you depress the clutch pedal, does the slave move immediately or is there a lag?