Hi Clarence Oveur, well, not really...
The accumulator alone is supposed to provide at least six full braking applications.
The policy while braking after such a failure, like manual reversion, is to apply steady brake pressure, without modulating.
While technically speaking it would still be possible to abort after losing all four pumps (you still have full braking capability and -slower- reversers), my points against this are:
the PF MUST look outside and not above, everybody knows aborting is much more dangerous than continuing, flying on cables only takes some more beef but is not difficult or dangerous at all, and the QRH clearly states that you don't abort for a master caution above 80kts.
Don't tell me the airplane is unsafe or unable to fly on cables only
