Sustain pedal plays a E, how to fix it ?

Hi everyone,

I have recently bring back my piano Kawai in order to have a good fingerboard to compose.

But a very annoying problem occurs, sometimes when I press the sustain pedal it plays a E4 and also keeps the sustain on endlessly...

I read on the forums that the sustain pedal produces a CC 64 an it can be misinterpret to be a E4.

I would like to know how to disable the assignment in Sonar, I went to Options->intrument->define but I don't understand anything...

Thanks :p