Two problems related to brake disc caliper have been reported for the 2008 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota 4Runner based on all problems reported for the 2008 4Runner.
Entire underbody of car is rusting out, tail gate already had 2 body repairs but keeps rusting out. Many parts at just 150k were already replaced due to severe rust- most suspension parts, transmission cooling lines, exhaust , skid plates all failed. Brake calipers failed 4 times in in 6 years.
I have gone through 2 sets of front brake calipers on my 2008 Toyota 4runner. It is a common issue where over time, the calipers will seize up and stick on. The only way to tell that there is an issue is either by touch, smell, or feel. Touch, because the rotors get to be over 250 degrees and they cannot be touched. Smell, because the smell of burning brake pads is present feel, because there is a loss of braking. Other than these indications, there is no notice of seized calipers until it is too late. This is a common issue and has happened with most 4runner owners that I talk to. I'm surprised that this has not become an issue.