Frothy sample?
Sorry I didnt read this sooner and always a shame when a mate goes.
I doubt that even the original brakes had had chance to bed in. I'm bemused by the lots of hooey written about discs. Hydraulic depends on the flexing of the hose, the calipers, the levers etc. I find just about all cable brakes the same as long as the brake lever doesnt flex.
Even the cheap nasty ones work well once bedded in. What doesnt help is when the novice rider sprays all sorts over them, buggering up the pads...