I had issues with the rear brake on my 821, very spongy to not working at all, had a garage look at it after I had struggled to get a pedal and they had exactly the same problems as I did, I put the bike in for its 9k service the other week and it came back with perfect brakes front and rear, I have no idea what they did differently but it may be worth trying a different dealer.
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04 S4R
15 821
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