marcas-form.js

//app/components/marcas/marcas-form.js
import Component from '@ember/component';

export default Component.extend({

  //https://guides.emberjs.com/v3.3.0/components/triggering-changes-with-actions/
  //https://github.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/closure-actions.md

  actions: {
    saveMarca(marca) {
      let selfthis = this;
      marca.save().then( function() {
        selfthis.sendAction('redirectTo');
      });
    }
  }
});

marcas-index.js

//app/routes/marcas/new.js
import Component from '@ember/component';

export default Component.extend({

  actions: {
    deleteMarca(marca) {
      marca.destroyRecord();
    }
  }
});

new.hbs

{{!--app/templates/marcas/new.hbs --}}
<h2>Criar nova marca</h2>
{{!-- https://github.com/ember-cli/eslint-plugin-ember/blob/master/docs/rules/closure-actions.md --}}

{{marcas/marcas-form 
  model="model"
  redirectTo=(action "redirectTo")
}}

new.js

//app/routes/marcas/new.js
import Route from '@ember/routing/route';

export default Route.extend({

  model() {
    return this.store.createRecord('marca');
  },
  //https://guides.emberjs.com/v1.12.0/components/sending-actions-from-components-to-your-application/
  actions: {
    redirectTo: function() {
      this.transitionTo("marcas");
    }
  }
});