It's most likely to be the fault within calipers either pistons sticking, floating guide pins sticking or handbrake shaft sticking or could be handbrake cales sticking.
I really doubt it's ABS pump at fault. If it was pump you would definitely hear it working as they are quite loud when in operation. Also no need to undo bleeding nipples to check it, that's just unnecessary work and waste of time, much simpler just to pull the fuse for ABS pump or unplug the pump.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
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