| I have seen a pattern lever cause a front brake to lock as well, on an R1 though.
Can't really see "wrong" fluid causing a problem severe enough to lock a wheel.
I would say you have done pretty well to get the dealer to repair the bike.
If you don't have all the parts that were on the bike at the time of the crash you are going to have trouble proving anything.
Had a problem with a CBR6 with the rear brake caliper falling off immediately after a service, the dealer apologised, supplied a new bolt taken off a bike in the showroom to replace the one that fell off but when I mentioned the paint that had been chipped off the rear wheel as the caliper flapped about they just gave me a tin of paint to sort it out myself!
Ray | 
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