One problem related to brake antilock control unit/module has been reported for the 2003 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota 4Runner based on all problems reported for the 2003 4Runner.
Brake pedal goes al the way to the floor when sitting at a stop . The 4 runner has 3 masters and one complete power brake unit installed by Toyota and I still have the problem, Toyota stated it is normal.