How does the twin circuit brakes work inside the master cylinder? Possibly the primary circuit circuit is leaky internally inside the master, so you're ending up one the secondary circuit, even though they are both bled ?
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Here we go. Do the back brake work? if they are't working, I'm betting the primary circuit in the master is dead.
Actually, what you are saying is 100% right. The differential/priority switch may be stuck over on the secondary circuit. Same deal, do you have rear brakes ?
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