Check the obvious things, is the brake fluid level full? is the switch used to measure it working?
Same goes for the parking brake pedal, try lifting on that to see if that causes the BRAKE light to go out
High mount won't cause any of that on these cars.
As for the ABS, yeah you need an appropriate scantool to read those codes.
I use both a Tech1 or Tech2 to pull those codes, if you're anywhere near Pittsburgh I could pull them for you.
Likely you have a couple separate issues, but on a 93' the ABS light is a non critical light, you just won't have any anti-lock is all.