searched and coudnt find

last week i threw a check engine light and got it read turned out to be a gas cap according to what i searched CL...
this morning on my way to school i press the brakes and it wont shift to drive?? and i noticed i press the brake my brakes lights dont come on!! now if i press lightly they come on but if i push down as if i was stopping they dont come on... so i press lightly and shift to drive and start driving and as i get to the stop sign ABS light comes on along with VSC.... then they turned off in like 10 seconds and my check engine light comes on...!!
had a busy day today messing around with the stang lol but im going to take it to get the codes read for the check engine... in the mean time ill be driving the stang around i dont wanna screw up the lex..

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nothing??? well i went to advance auto and got codes p0440 p0441 p0446 and the guy told me gas caps and to replace my gas cap... i asked him whats up with my lights he said turn on the brake switch?? now where would that be?