Join Date: Nov 2007
Location: Oregon, Chile, Alberta, Texas
The first thing you want to do is check your tire air pressure. These tires are very sensitive to air pressure and one that is even at only 2 psi more than the other will be larger in diameter and have greater braking force, pulling to that side.
If that is not the case, then check the circumference of all your tires with a tape measure. If one is larger from a manufacturing defect or from being overfilled and setting for a long time, that is the way it will pull.
If the brake is spongy then bleeding is in order, but normally air in a brake line will diminish braking equally and not result in pulling to one side or the other. Several motorcycle accessory manufacturers do sell a modified bleed valve that makes this process much simpler than with the OEM valve.
Sometimes the caliper slides get sticky from corrosion, and that can cause one side to pull slightly, but usually you will hear this as a squeaking or scraping from one side or the other.
If toys will get me in the door when it is time to go, I have it made!