Originally Posted by BB9

What you describing is exactly what was happening on my car. You can try brake system bleeding with linear actuator calibration (if you haven't tried it yet) but you have to use Techstream for this procedure and it has to be done right. I'd recommend to go straight to the dealer because Lexus would have to verify proper bleeding before they condemn the actuator and they don't trust other shops in this matter. I did bleeding at the local shop at first but the dealer had to do it again anyway and I had to pay for it. Bleeding did helped me for some time but at the end actuator had to be replaced.