that must have been a scary moment, and under the wrong road conditions
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!!!!
It should be almost impossible for an ABS unit to malfunction in that way.
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.
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.brakes are safety critical items and go through quite severe failure mode analysis during design.
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.
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.
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Sometimes you can get a sticking piston that will seize the brake on to that wheel although I've never experienced it to be an
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'emergency stop' level of braking.
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End result is pads smoking and disc, caliper and hub seriously hot.
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.
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.but, when it all cools down the piston has freed itself.
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I had exactly this today driving up the M5, the NS front stuck a little and it got worse the longer I drove for obvious reasons.
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Then after parking on the drive for an hour the piston has released