wht99gs400tx

Hi, I know this is an old post but i had the exact same problem for over a year! the ABS, VSC OFF, & BRAKE warning lights would come on instantly with a loud constant BEEP sound. The lexus and toyota dealerships both said they had never heard of this issue and charged me a few hundred bucks to let me know they couldnt help me. Believe it or not, the constant BEEP and the purge of the master cylinder which sounds like a choking terradactyl was caused by my front ball joints being completely worn out. once i replaced the ball joints, the annoying problem i had considered selling my car for was gone for good!!! :D the sensors think your car is out of balance or out of traction due to the misalignment of the ball joints. i'm by no means a mechanic, but this is how i fixed this horrible problem. it's been over a year and my 99 gs400 runs like a champ with 132K miles :) Good luck!