Brake Master Cylinder: Inspection

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT BRAKE MASTER CYLINDER
1. Check the inside of the master cylinder body for scratch.
  If scratched, replace the brake master cylinder sub-assembly with a new one.
  
  Fig 1: Checking Inside Of Master Cylinder Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002