Brake Push Rod Spring

Just how important is the push rod spring to the function of the brake pedal and system. Mine is broken. Not sure I could find one around here and I don't think they can be found new. Seems like it's main purpose is the keep the pedal from actuating the brake light switch. It would be nice the find some kind of replacement. Anyone have any ideas on that? The one I need is on the far right in the diagram.
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