http://press.codes/forums/topic/fluid-navbar-in-a-wide-layout-flipping-jumbotron-and-secondary-navbar/

functions.php

<?php

function replace_secondary_menu() {
  global $ss_menus;
  // remove secondary navbar as added in /framework/bootstrap/includes/class-Shoestrap_Menus.php#L22
  remove_action( 'shoestrap_pre_wrap', array( $ss_menus, 'secondary_navbar' ) );
  // add our new navbar on top of Jumbotron area
  add_action( 'shoestrap_pre_wrap', 'my_secondary_navbar', 1 );
}
add_action( 'wp', 'replace_secondary_menu' );

function my_secondary_navbar() {
  // this is a copy of /framework/bootstrap/includes/class-Shoestrap_Menus.php#L248
  // we simply remove the wrapper with the container class for a full-width navbar under a wide layout
  global $ss_settings, $ss_framework, $ss_menus;
  if ( has_nav_menu( 'secondary_navigation' ) ) : ?>

      <header class="secondary navbar navbar-default <?php echo $ss_menus::navbar_class( 'secondary' ); ?>" role="banner">
        <button data-target=".nav-secondary" data-toggle="collapse" type="button" class="navbar-toggle">
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
          <span class="icon-bar"></span>
        </button>
        <?php
        if ( $ss_settings['navbar_secondary_social'] != 0 ) {
          SS_Framework_Bootstrap::navbar_social_links();
        } ?>
        <nav class="nav-secondary navbar-collapse collapse" role="navigation">
          <?php wp_nav_menu( array( 'theme_location' => 'secondary_navigation', 'menu_class' => apply_filters( 'shoestrap_nav_class', 'navbar-nav nav' ) ) ); ?>
        </nav>
      </header>

  <?php endif;
}