Join Date: Jan 2007
Sportbike: yamaha r6
Years Riding: I used to ride...
How you found us: NESBA
With the -2 lines, you are getting a smaller inner diameter, however that does not cause the pistons to advance any further in the caliper per lever stroke in the master cylinder. What it will do for you is give you a smaller effective area for the fluid pressure to work on inside of the lines (which assuming the lines have the same stiffness as the larger ID lines) thus resulting in a stiffer feeling system. Also, you have an overall lower fluid volume in the system, and while brake fluid is primarily incompressible, there is some compression and therefore a smaller amount of fluid will also lead to a stiffer feeling system.
In a nutshell: -2 lines provide slightly stiffer lever feel, but no addition "power" in terms of actual mechanical advantage. You put 10 lbs of force into the brake lever on a system with standard rubber lines, braided lines, or -2 braided lines, and you will get the same braking force, the only thing that will change is how much lever stroke it took to get to that braking force.
Pads, master cylinder sizing, caliper sizing, lever sizing, are pretty much the only things you can change in the brake system to change the power of the brakes.
Last edited by stive403; 11-14-2007 at 03:19 PM.