I accidentally did this test a while back driving an Explorer without ABS.
I had the front tires around 45-50 psi on the front. These were newer Cooper tires. Anyway, I had to do an emergency stop and went well past the point I would have liked to have stopped and had done before in this truck. Problem was the brakes locked up and i panicked and held the pedal down. Since this time I've been a big fan of ABS. Maybe you can theoretically stop quicker without ABS, but I don't live in the theoretical world. Either way, I lowered the PSI to 40 and the braking was much better.
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