ok why not get the scan codes, the flash codes from the ECU.?
you insert a 5cent paper clip jumper in to the Diagnostic, jumper plug
and it flashes out what test is failing.
the operators guide covers the BRAKE lamp.
low fluid, or hand brake sticking on, or brake failure.
the tests are in the FSM , or alldata.com for brake lamp.
burning cant be done online, only hands on eyes on.
1st google hit, there are 1000s on topic, would wide.
http://www.yotatech.com/f116/where-obd-port-1994-4runner-245656/
"1994 4runner ecu check jumper"
my search string.....
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