rear brake pedal not returning

[fbmbmx]

Well i fitted my scs rearsets today and everything is fine apart from my rear brake pedal won't return after you brake. At the moment i have fitted a spring between the master cylinder and the rear of the pedal but now there is no fell of the rear brake (having to put it down very hard to compress the spring). I have tried with a looser spring but the lever won't return.
Thanks
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Suzuki gsxr 600-2003

[kawakid]

Shouldn't this be in Workshop?
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I've a twin and a 4.