I'm with Dieselnut on this, I'd want to be 100% certain that it is the ABS before buying one, Simple because This is not the kind of fault I'd associate with an ABS pump.
As has been said, It could be a flexible brake hose has internally failed (I've seen this many times) or it could be the master cylinder itself has failed on one circuit. Has your mechanic tried to get fluid out of the rear wheel on the opposite side of the car? that should tell if it is a master cylinder fault. or even just open the brake unions a turn on the master cylinder and see if fluid comes from both when the pedal is pressed?
Like with all faults, Diagnosis is much cheaper than throwing expensive parts at it.
If the fault was with the ABS it should show a warning light for the ABS.
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