Re: International 1992 Brake Press Light?
If you have air brakes, there will be a buzzer that warns you not to drive until both air tanks have enough pressure to work the service brakes. The parking/emergency brakes, or "spring brakes," work on the absence of the air that holds back the engagement springs while moving. Air brakes also do not have brake fluid nor brake fluid reservoirs, so you would not be able to find one.**
If you have power-assisted hydraulic brakes, then there should be a buzzer that warns you if you lack engine vacuum to operate the power assist. Heavy vehicles with hydraulic brakes should have an electric vacuum pump to assist the engine, because the engine vacuum drops to zero or nearly so when your pedal is to the metal.
In either case, if you run the engine a bit and the buzzer stops and the light goes out, and does not come back on as soon as you step on the pedal, you are probably ok.
If you have air brakes, you must have two air pressure gauges, or one dual-needle gauge. You should read up on pre-trip tests for your air brake system. If you have hydraulic brakes, you may instead have a vacuum gauge on the panel in addition to the light and buzzer.
** Some posters here at skoolie.net have referenced "the dreaded Lucas-Girling air-over-hydraulic brake" system. I am not familiar with that hybrid, so if that is what you have, you are on your own . . .
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.