Ok, I'm pretty new to the forum but I read everything on this topic and not seen anything about the issue I had 3 weeks after I bought my 2006 Land Cruiser with 110k on it. My brake went completely out and all the abs, trac, brake lights were on and a buzzer was on constant. I got out of the vehicle and tapped the booster assembly and the motor came back on and all lights went brakes worked imediatly after the booster built pressure. I thought this was it, but it came back on when I got home. I tapped again the motor on the bottom of the master brake assembly and it came back on again. But this did not last long. Eventually it would not come back on and you HAVE to be careful tapping this because there are magnet inside that you could break. But I pulled the whole system(Master assembly) out with some directions on this forum and pulled the motor off the bottom. Pulled it apart and the culprit was pretty obvious. The brushes had wore the copper plating off the armature or commentators inside the motor. I found a electric motor repair guy (this took a lot of calls) and this retired guy fixed in in his garage behind his house. Installed it and works great now. He only charge me 185 bucks, I gave him 200. The dealership wanted 1400 just for the motor and they are the ONLY ones that can sell you this motor new. See Pics