diff --git a/frontend/src/domains/new_dashboard/components/layout/Header.tsx b/frontend/src/domains/new_dashboard/components/layout/Header.tsx
index 43f96e4..0ecb2cc 100644
--- a/frontend/src/domains/new_dashboard/components/layout/Header.tsx
+++ b/frontend/src/domains/new_dashboard/components/layout/Header.tsx
@@ -2,7 +2,6 @@ import { useAuth } from "@/domains/auth/application/AuthContext";
 import { Bell, ChevronDown, Mail } from "lucide-react";
 import { useCallback, useEffect, useRef, useState } from "react";
 import { useLocation, useNavigate } from "react-router-dom";
-import { initialMessages, initialNotifications } from "../../constants";
 import {
   clearDashboardNotifications,
   getDashboardNotificationFeed,
@@ -30,9 +29,9 @@ export function Header({
   title,
   userProfile,
   userInitials,
-  unreadNotifications = 1,
-  messages = initialMessages,
-  notifications = initialNotifications,
+  unreadNotifications = 0,
+  messages = [],
+  notifications = [],
 }: HeaderProps) {
   const location = useLocation();
   const navigate = useNavigate();
@@ -117,7 +116,10 @@ export function Header({
       });
       setUnreadCount(notificationsResult.unreadCount);
     } catch {
-      // Mantém os dados de fallback até a API estar disponível.
+      setMenuMessages([]);
+      setMenuNotifications([]);
+      setUnreadMessagesCount(0);
+      setUnreadCount(0);
     }
   }, [user]);
 
diff --git a/frontend/src/domains/new_dashboard/constants/initialData.ts b/frontend/src/domains/new_dashboard/constants/initialData.ts
index f2a363e..3878986 100644
--- a/frontend/src/domains/new_dashboard/constants/initialData.ts
+++ b/frontend/src/domains/new_dashboard/constants/initialData.ts
@@ -4,8 +4,6 @@ import type {
   JobStatus,
   JobType,
   Mentor,
-  Message,
-  Notification,
   SearchPreferences,
   UserProfile,
 } from "../types";
@@ -149,44 +147,6 @@ export const initialMentors: Mentor[] = [
   },
 ];
 
-export const initialNotifications: Notification[] = [
-  {
-    id: 1,
-    text: "Sua candidatura para Stellar Tech foi visualizada pelo recrutador.",
-    type: "info",
-    date: "Há 10 min",
-  },
-  {
-    id: 2,
-    text: "O mentor Julio Silva aceitou o seu convite de mentoria para quarta-feira.",
-    type: "success",
-    date: "Há 2 horas",
-  },
-  {
-    id: 3,
-    text: "Vaga compatível encontrada: Desenvolvedor React na TechCorp.",
-    type: "match",
-    date: "Há 1 dia",
-  },
-];
-
-export const initialMessages: Message[] = [
-  {
-    id: 1,
-    sender: "Julio Silva (Mentor)",
-    text: "Olá Bruna! Consegue enviar seu portfólio antes do nosso papo?",
-    date: "11:15",
-    origin: "mentor",
-  },
-  {
-    id: 2,
-    sender: "RH Fintech Hub",
-    text: "Olá! Gostaríamos de marcar uma conversa técnica esta semana.",
-    date: "Ontem",
-    origin: "recruiter",
-  },
-];
-
 export const initialUser: UserProfile = {
   firstName: "Bruna",
   lastName: "Silva",
diff --git a/frontend/tests/unit/new_dashboard/branch-coverage.test.tsx b/frontend/tests/unit/new_dashboard/branch-coverage.test.tsx
index f78f528..20e529b 100644
--- a/frontend/tests/unit/new_dashboard/branch-coverage.test.tsx
+++ b/frontend/tests/unit/new_dashboard/branch-coverage.test.tsx
@@ -122,7 +122,7 @@ describe("new_dashboard branch coverage", () => {
     });
   });
 
-  it("cobre fallback do header sem usuário e menus vazios", () => {
+  it("exibe estados vazios do header sem dados reais", () => {
     renderWithRouter(<Header />);
 
     expect(screen.getByLabelText("Mensagens")).toBeInTheDocument();
@@ -132,13 +132,60 @@ describe("new_dashboard branch coverage", () => {
 
     fireEvent.click(screen.getByLabelText("Mensagens"));
     expect(screen.getByText(/lidas/i)).toBeInTheDocument();
+    expect(screen.getByText("Nenhuma mensagem recente.")).toBeInTheDocument();
+    expect(screen.queryByText("Julio Silva (Mentor)")).not.toBeInTheDocument();
 
-    fireEvent.click(screen.getByText("Julio Silva (Mentor)"));
+    fireEvent.click(screen.getByLabelText("Notificações"));
+    expect(screen.getByText("Nenhuma notificação recente.")).toBeInTheDocument();
+  });
+
+  it("limpa os feeds quando a API falha e mantém os estados vazios", async () => {
+    mockUseAuth.mockReturnValue({
+      user: { email: "ana@exemplo.com" },
+      logout: vi.fn(),
+    });
+    vi.mocked(getDashboardNotificationFeed).mockRejectedValue(
+      new Error("API indisponível"),
+    );
+
+    renderWithRouter(
+      <Header
+        messages={[
+          {
+            id: "legacy-message",
+            sender: "Julio Silva (Mentor)",
+            text: "Mensagem de seed",
+            date: "11:15",
+            origin: "mentor",
+          },
+        ]}
+        notifications={[
+          {
+            id: "legacy-notification",
+            text: "Vaga compatível encontrada: Desenvolvedor React na TechCorp.",
+            type: "match",
+            date: "Há 1 dia",
+          },
+        ]}
+        unreadNotifications={1}
+      />,
+    );
+
+    await waitFor(() => {
+      expect(screen.queryByText("Julio Silva (Mentor)")).not.toBeInTheDocument();
+    });
+
+    fireEvent.click(screen.getByLabelText("Mensagens"));
+    expect(screen.getByText("Nenhuma mensagem recente.")).toBeInTheDocument();
+    expect(screen.queryByText("Julio Silva (Mentor)")).not.toBeInTheDocument();
+
+    fireEvent.click(screen.getByLabelText("Notificações"));
+    expect(screen.getByText("Nenhuma notificação recente.")).toBeInTheDocument();
     expect(
-      screen.getByRole("heading", { name: "Julio Silva (Mentor)" }),
-    ).toBeInTheDocument();
-    expect(screen.getByText("Mentoria")).toBeInTheDocument();
-    expect(screen.getAllByRole("button", { name: "Fechar" })).toHaveLength(2);
+      screen.queryByText(
+        "Vaga compatível encontrada: Desenvolvedor React na TechCorp.",
+      ),
+    ).not.toBeInTheDocument();
   });
 
   it("carrega feeds reais, limpa alertas e abre menus do header autenticado", async () => {