\version "2.16.2"

global = {
  \key c \major
  \time 4/4
}
\language "english"
\layout {
  indent=9.5\cm
}

right = \relative c'' {
  \global
  \once \override Staff.Clef #'stencil = ##f
  \once \override Staff.TimeSignature #'stencil = ##f
  %  \once \override Score.SystemStartBrace #'stencil = ##f
  c1 c1 c1 \break c1 c1
}

left = \relative c' {
  \global
  \once \override Staff.Clef #'stencil = ##f
  \once \override Staff.TimeSignature #'stencil = ##f
  
  c1 c1 c1 c1 c1
}

\score {
  
  \new PianoStaff 
  <<
    \override Score.SystemStartBrace #'stencil =
    #(lambda (grob)
       (let* ((orig (ly:grob-original grob))
              (siblings (if (ly:grob? orig)
                            (ly:spanner-broken-into orig)
                            '())))
         (if (and (>= (length siblings) 2)
                  (eq? (car siblings) grob))
             #f
             (ly:system-start-delimiter::print grob))))
       
    \new Staff = "right" \right
    \new Staff = "left" { \clef bass \left }
  >>
}