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open glove box, take out opr, guide, no year stated, 1972 PU?
no year, no joy but in general
brake lamp on.
1: parking brake stuck on. or switch to it bad.
2: main braking system failure.
3: low brake fluid, in master cylinder filler.
i think every opr guide made says that, not just a 1972 , lol
ABS sensor(s) could be bad or dirty/misadjusted. If the sensor stops working, it thinks the wheels are locked up and will modulate the brake pressure causing the braking distance to be scary long. Have it looked at ASAP. The sensors are at each wheel and point right at the toothed wheels on each axle. Check fluid first of course.
When you release the brake pedal, there is a switch underneath the brake pedal that disconnects the circuit to your brake lights causing your brake lights to switch off. Sometimes this brake light switch will go bad and need replacement. If your brake light stays on after you turn your car or truck off and you don't want to run your battery down, you may be able to get down underneath the brake pedal and manually pull up on the brake light switch to deactivate it until you can get it repaired. and i think you can make a diagnostic by yourself and the Autel MaxiDAS DS708can help you
I think your traction control button is on the center console behind the Shifter.
But, I don't think that is the problem. That switch will cause the traction control and light to turn on and off. It should not affect the brake light and anti-lock light.
I would first check your brake fluid level. Top it off with the correct fluid. The fluid is a DOT number; like DOT3 or DOT5. Use the correct DOT fluid.
If the fluid is very low, you may need your brake fluid system bled to remove any air. And you may want to check the brake pads. Low fluid may mean you need new pads.
If that doesn't work, go to an auto parts store that will scan your car for ODB2 error codes. AutoZone will do it for free. I suspect you may have a bad wheel bearing. That will cause the ABS and Trac lights to go on. I've replaced GM bearing/sensors on several of my cars. The last one was my 2005 Bonneville. The bearing and sensor are combined in one unit.