MuuMuu101's 68 Dart, A Learning Process...

You won't be able to completely lock the brakes on that Scion. Every car MY2011+ has stability control - which includes ABS. You probably heard some light chirping and a motor type sound under the hood...and some clicking.

I also have a 1 1/32 master cylinder and the normal stopping is pretty good, but its harder to lock the brakes up. Provided you don't loose master cylinder stroke, you can build more pressure with less pedal force with a smaller master cylinder (will also increase travel). As it goes, P=F/A (Pressure=force/area).