• Can't find leakage, lbs man thought it was a seal/valve in the brake lever/reservoir giving way under pressure. Is that unlikely? It's how he explained the initial bite then instant fade in power...

  • I guess the obvious suggestion would be to swap the levers and see if that cures the front brake and kills the rear. Then you know you have a problematic master cylinder.

    But what I faff to do so. I see your predicament when a pair of Deore brakes are supercheaps.

  • Especially when the extent of my hydro maintenance experience is replacing pads and burping. (And I bled a motorbike disc system once)

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