One problem related to brake master cylinder has been reported for the 2009 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Toyota Tundra based on all problems reported for the 2009 Tundra.
Brake pedal suddenly turned soft and goes all the way down before it starts to grab. Put in new pads all around, new master cylinder and had system completely bled, problem still there. Checked out Toyota Tundra forums and this seems to be a problem on these trucks, only has 63,000 miles. Everyone says that it is an abs module problem costing over $2000. 00 to fix.