One problem related to brakes failed has been reported for the 2009 Lexus GS. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Lexus GS based on all problems reported for the 2009 GS.
While driving the vehicle, the brake actuator failed, causing it to be unsafe to drive. This is a known issue with thousands of Lexus/toyotas produced around this time. Instead of warranty enhancement (which my car no longer qualifies for), this should be a recall so all vehicles with this faulty component can be properly repaired. The cost to repair was quoted from the dealer at $3800!.