How can I read brake codes on my Gen 1 and other brake questions

Brian in Tucson, Awesome!
I went through to clean the front wheel sensors, and then bleed brakes to clear any air in the line. And then a Thwack as you mentioned.
Error came intermittent for a few minutes, and while the engine was running, i gave another Thwack on the Brake master Cylinder. And went for a drive 15KM. stopped the engine for 20 minutes. Started Engine, no error.
Its almost 24 hours now and I have been starting the car every few hours and no error.
Thank you. I believe you have save me a few grand.
BUT I believe the Thwack may damage Brake master Cylinder.... for which I believe its the soloneoid cap on the Master cylinder that has become static. I wish i could become an agent for Prius users in my country to save them money if I can find a soloneoid repair agency in Australaisia.. preferably Australia/New Zealand. I am searching if anyone can repair, if not then best bet will be USA or Japan.