SGC, in your scenario (#21) the wheels would not lock as the antiskid system will reduce the brake pressure to maintain wheel rotation whilst still attempting to achieve the ‘maximum’ retardation in the poor conditions. Hence some systems may be described as ‘cycling’ the brakes on-and-off on a low friction runway.
Retardation may not be as expected, but often crews are unaware of this at higher speeds particularly if thrust reverse is contributing a significant proportion of the retardation. However, after cancelling reverse, the relative ineffectiveness of the brakes may be sensed and could be interpreted as a brake failure due to the low level of deceleration.
For those who wish to know the
Brake Pedal Force required to disengage autobrake (page 16).