Recently picked up my 03 wrx.. driving to work this morning I noticed under full boost the break and battery lights flash just for a second. I am able to duplicate it repeatedly. Stopped after work and had the alternator and battery tested both passed with flying colors. Also checked the break fluid resivor which was full.
I am new here but learned a long time ago to search first that being sais i found only 1 thread and after reading it wasn't the same issue.
Sorry for the spelling and punctipuation not easy on my phone to type this out