cobia7

i have an 94 es 300,yesterday applying the brakes would cause the radio and ac to shut off for 2 to 3 seconds and the doors locked.happened 2 to 3 times then the car stalled.no power to starter from ignition but everything else works,lights,radio,locks,windows,etc battery seems good.is the a brake switch or relay that controlls the starter thru the key that is bad? thx for any help out there dave