@joyride I’m sorry you’re having problems with your speakers going on and off with your brakes. Have you tried contacting your local Scion dealership? If not, you may want to try seeking them out as they would be able to help you figure out the problem. I hope this helps.

Good luck!
-Paul
paul@americanpopdigital.com
I work with Scion, see full disclosure here - http://cmp.ly/4/qrbca1