It never ceases to amaze me of a minority of intellectual instead of answering the question, but to throw in insults and comments.
I am off for days away from work without access to AMM and MEL. So I thought it would be easy to find answers here instead of searching in internet. How wrong I am again after vowing to retire from prune.
After spending times downloading MMEL and QRH to fill up my tablet, I have the answers here.
1) The hyd system pressure with B pump on remains 3000 psi. the acc. Gauge press varies with pre- charge press. A no go situation.
2) MMEL has no MEL regarding low acc press, at W/w gauge, so no go. even from the schematic, that the brakes appear to be fully functional with 3000 psi.