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ABS sensors are basically a speedometers on each wheel.
ABS computor monitors sensor speed to detect differemces,
If say one wheel locks up it's speed drops below the others and the ABS system reduces pressure to that line only,
In effect the brake to the locking wheel is disabled.
All that said I would run a "GLOBAL SCAN" using Peugeot Planet diagnostics.
This is Pugeot's own software and runs a test on every connected electrical module on the vehicle,
Any stored fault codes will show up.
And no offense but Snap on diagnostics just isn't as accurate.
My main suspect in this case would be possible damage to the sensor or reluctor ring during the disk replacement.
Though I have seen similar from rust build up on the reluctor ring,dirt on the same,incorrect air gap between sensor and ring,failing wheel bearing and even uneven tire wear on wheel/tires.
PP diagnostics should pin down to which wheel the "anomaly" is coming from,
PP diagnostics live data will give the output reading from the sensor and if required an ocilliscope waveform patter will confirm,
Snap On's 'scopes will do just fine for this.
In comparison with other wheel sensors if needed.
I suspect the scope pattern will show a glitch caused by a damaged reluctor ring.
And as there are only four wheel sensors one of them does double duty as the output for the speedometer which may go some way to possible inaccurate MPG figures.
Everything with an ECU is interconnected on these through a system called BODY SYSTEM INTERFACE,
So a global scan of this is a good first step.
But as stated this needs Peugeot Planet diagnostics systems.
If only the main dealer/importer.
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