theamrad
On the A320, is there not still a recall drill (not on ECAM) for 'Loss of Braking'?
There was in my day. It required switching the A/Skid & N/W Strg switch off and then manually braking with max 1000psi pressure.
If that was unsuccessful then you were to use short and successive applications of the park brake.
It was a published procedure, so I presume that it has happened to the extent that Airbus had to devise a procedure [I don't recall it on any Boeing I have flown], although I, fortunately, never suffered myself.
In the event of a slippery runway, determining the cause for the lack of braking may well be very difficult in the heat of the moment, no?
All of this is just speculation, but with basis in fact on the A320 family