One problem related to power assist brake vacuum has been reported for the 2008 Toyota Highlander. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Highlander based on all problems reported for the 2008 Highlander.
No previous braking problems experienced. First heard an airy sound when braking then soft brake pedal and then almost complete brake failure. Dealer found a vacuum leak in brake booster. Repair was replacement of the brake booster.