UK Car Repair Questions? Ask a Mechanic for Answers ASAP
can you tell me if the master cylinder has been replaced ? as if it has then its possible that you need to run the ABS pump to move any trapped air inside
the dealer method is to use the diagnostic tool to cycle the ABS during bleeding
however I've had good results by just taking the car for short drive and stamping on the pedal at low speed to lock the brakes and trigger the ABS and then re-bleed
If you still have an issue then it could be a flexible brake line is ballooning under pressure, this can't always be seen from the outside so to test this use a hose clamp on each line in turn to close off then lines one at time . Push the pedal in between and see if you can feel any difference as each line is closed off.
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