Toyota Avalon owners have reported 1 problem related to power assist brake vacuum (under the service brakes category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota Avalon based on all problems reported for the Avalon.
Slow loss of brake fluid on 2004 Toyota Avalon xls. Dealer had to replace brake master cylinder and brake booster. Repairs were covered under warranty, however I feel that this was a serious problem and one that should be reported as there may be other vehicles with similar problem.
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all problems of the 2004 Toyota Avalon
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