One problem related to brake hoses, lines/piping, and fittings has been reported for the 2006 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota 4Runner based on all problems reported for the 2006 4Runner.
4runner has been garage kept, and the exterior looks perfect, lost all brake fluid, mechanic put on lift and found left rear brake line rusted through and then pointed out that the frame is severly rusted and would not pass inspection. Trailer hitch, will fall off if I try and use it. Box frame is rusted out on the bottom from front of vehicle to the very back. My wifes 2000 Lexus SUV has no rust on frame and drives the same commute each day as me.