Originally Posted by aosborn
Have you made the change to the 1 1/8" bore yet? How did you like it?
It would definitely reduce the pedal travel, but at cost of too much foot pressure has been my experience. With a manual 4 wheel disc setup, decreasing the bore to 15/16" or leaving it at 1" is probably the best solution. Due to the fact that discs don't 'self-energize' like drum brakes calls for increasing line pressure in the system and going larger on the master cylinder bore and reducing line pressure (all else being equal) usually doesn't work out.
Regardless of master cylinder bore size, make sure you have enough pedal travel in the car to bottom out the master cylinder should you happen to lose pressure on half the system. This can happen when a hose or caliper seal fails on either the front or rear brakes. If that happens, you will need all the travel available to stop the car.
I decided to leave the 1" MC in it after driving it for a while. It is just slightly longer throw than before and seems fine after driving it. Plenty of room to bottom the MC out.