I have no idea. I do know that if you take it to Toyota, they can cycle the ABS via the computer and make sure that you don't have air in the ABS manifold, which is extremely important. If you do it yourself, you typically have to do a proper bleed, then exercise the ABS, then another bleed, and possibly another ABS cycle followed by another bleed to ensure all air is out of the system. That's ONLY if you get air into the system to begin with by letting the level drop in the MC or do an improper bleed. 
