diff --git a/chromium_src/chrome/browser/sync/sync_service_factory.cc b/chromium_src/chrome/browser/sync/sync_service_factory.cc
index bbd2ade1cb89..401fd39ae093 100644
--- a/chromium_src/chrome/browser/sync/sync_service_factory.cc
+++ b/chromium_src/chrome/browser/sync/sync_service_factory.cc
@@ -3,10 +3,35 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#include "chrome/browser/sync/sync_service_factory.h"
+
+#include "base/command_line.h"
 #include "brave/browser/sync/brave_sync_service_impl_delegate.h"
+#include "brave/components/brave_sync/brave_sync_prefs.h"
 #include "brave/components/sync/service/brave_sync_service_impl.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/sync/device_info_sync_service_factory.h"
+#include "components/sync/base/command_line_switches.h"
+
+// Below includes are just to prevent redefining of
+// |BuildServiceInstanceForBrowserContext|.
+#include "chrome/browser/bookmarks/bookmark_model_factory.h"
+#include "chrome/browser/commerce/product_specifications/product_specifications_service_factory.h"
+#include "chrome/browser/consent_auditor/consent_auditor_factory.h"
+#include "chrome/browser/favicon/favicon_service_factory.h"
+#include "chrome/browser/metrics/variations/google_groups_manager_factory.h"
+#include "chrome/browser/password_manager/password_receiver_service_factory.h"
+#include "chrome/browser/password_manager/password_sender_service_factory.h"
+#include "chrome/browser/plus_addresses/plus_address_setting_service_factory.h"
+#include "chrome/browser/power_bookmarks/power_bookmark_service_factory.h"
+#include "chrome/browser/search_engines/template_url_service_factory.h"
+#include "chrome/browser/security_events/security_event_recorder_factory.h"
+#include "chrome/browser/sharing/sharing_message_bridge_factory.h"
+#include "chrome/browser/spellchecker/spellcheck_factory.h"
+#include "chrome/browser/ui/tabs/saved_tab_groups/saved_tab_group_service_factory.h"
+#include "chrome/browser/web_applications/web_app_provider_factory.h"
+#include "chrome/browser/webauthn/passkey_model_factory.h"
+#include "chrome/browser/webdata_services/web_data_service_factory.h"
 
 #define BRAVE_BUILD_SERVICE_INSTANCE_FOR                        \
   std::make_unique<syncer::BraveSyncServiceImpl>(               \
@@ -16,6 +41,33 @@
           HistoryServiceFactory::GetForProfile(                 \
               profile, ServiceAccessType::IMPLICIT_ACCESS)));
 
+#define BuildServiceInstanceForBrowserContext \
+  BuildServiceInstanceForBrowserContext_ChromiumImpl
+
 #include "src/chrome/browser/sync/sync_service_factory.cc"
 
+#undef BuildServiceInstanceForBrowserContext
 #undef BRAVE_BUILD_SERVICE_INSTANCE_FOR
+
+std::unique_ptr<KeyedService>
+SyncServiceFactory::BuildServiceInstanceForBrowserContext(
+    content::BrowserContext* context) const {
+  auto* command_line = base::CommandLine::ForCurrentProcess();
+  Profile* profile = Profile::FromBrowserContext(context);
+
+  // To pass the custom sync service URL to the sync service if it's not
+  // managed.
+  if (!profile->GetPrefs()->IsManagedPreference(
+          brave_sync::kCustomSyncServiceUrl)) {
+    if (!command_line->HasSwitch(syncer::kSyncServiceURL) ||
+        command_line->GetSwitchValueASCII(syncer::kSyncServiceURL).empty()) {
+      command_line->AppendSwitchASCII(
+          syncer::kSyncServiceURL,
+          profile->GetPrefs()
+              ->GetString(brave_sync::kCustomSyncServiceUrl)
+              .c_str());
+    }
+  }
+
+  return BuildServiceInstanceForBrowserContext_ChromiumImpl(context);
+}
diff --git a/chromium_src/chrome/browser/sync/sync_service_factory.h b/chromium_src/chrome/browser/sync/sync_service_factory.h
new file mode 100644
index 000000000000..7d2e82ad7b9c
--- /dev/null
+++ b/chromium_src/chrome/browser/sync/sync_service_factory.h
@@ -0,0 +1,19 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef BRAVE_CHROMIUM_SRC_CHROME_BROWSER_SYNC_SYNC_SERVICE_FACTORY_H_
+#define BRAVE_CHROMIUM_SRC_CHROME_BROWSER_SYNC_SYNC_SERVICE_FACTORY_H_
+
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+
+#define BuildServiceInstanceForBrowserContext         \
+  BuildServiceInstanceForBrowserContext_ChromiumImpl( \
+      content::BrowserContext* profile) const;        \
+  std::unique_ptr<KeyedService> BuildServiceInstanceForBrowserContext
+
+#include "src/chrome/browser/sync/sync_service_factory.h"  // IWYU pragma: export
+#undef BuildServiceInstanceForBrowserContext
+
+#endif  // BRAVE_CHROMIUM_SRC_CHROME_BROWSER_SYNC_SYNC_SERVICE_FACTORY_H_