diff --git a/tempest/services/volume/base/base_availability_zone_client.py b/tempest/services/volume/base/base_availability_zone_client.py
deleted file mode 100644
index 1c2deba..0000000
--- a/tempest/services/volume/base/base_availability_zone_client.py
+++ /dev/null
@@ -1,27 +0,0 @@
-# Copyright 2014 NEC Corporation.
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-
-from tempest.lib.common import rest_client
-
-
-class BaseAvailabilityZoneClient(rest_client.RestClient):
-
-    def list_availability_zones(self):
-        resp, body = self.get('os-availability-zone')
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/base/base_extensions_client.py b/tempest/services/volume/base/base_extensions_client.py
deleted file mode 100644
index b90fe94..0000000
--- a/tempest/services/volume/base/base_extensions_client.py
+++ /dev/null
@@ -1,28 +0,0 @@
-# Copyright 2012 OpenStack Foundation
-# All Rights Reserved.
-#
-#    Licensed under the Apache License, Version 2.0 (the "License"); you may
-#    not use this file except in compliance with the License. You may obtain
-#    a copy of the License at
-#
-#         http://www.apache.org/licenses/LICENSE-2.0
-#
-#    Unless required by applicable law or agreed to in writing, software
-#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-#    License for the specific language governing permissions and limitations
-#    under the License.
-
-from oslo_serialization import jsonutils as json
-
-from tempest.lib.common import rest_client
-
-
-class BaseExtensionsClient(rest_client.RestClient):
-
-    def list_extensions(self):
-        url = 'extensions'
-        resp, body = self.get(url)
-        body = json.loads(body)
-        self.expected_success(200, resp.status)
-        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/availability_zone_client.py b/tempest/services/volume/v1/json/availability_zone_client.py
index 3a27027..be4f539 100644
--- a/tempest/services/volume/v1/json/availability_zone_client.py
+++ b/tempest/services/volume/v1/json/availability_zone_client.py
@@ -13,9 +13,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_availability_zone_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class AvailabilityZoneClient(
-        base_availability_zone_client.BaseAvailabilityZoneClient):
+class AvailabilityZoneClient(rest_client.RestClient):
     """Volume V1 availability zone client."""
+
+    def list_availability_zones(self):
+        resp, body = self.get('os-availability-zone')
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v1/json/extensions_client.py b/tempest/services/volume/v1/json/extensions_client.py
index f99d0f5..7b849a8 100644
--- a/tempest/services/volume/v1/json/extensions_client.py
+++ b/tempest/services/volume/v1/json/extensions_client.py
@@ -13,8 +13,17 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_extensions_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class ExtensionsClient(base_extensions_client.BaseExtensionsClient):
+class ExtensionsClient(rest_client.RestClient):
     """Volume V1 extensions client."""
+
+    def list_extensions(self):
+        url = 'extensions'
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/availability_zone_client.py b/tempest/services/volume/v2/json/availability_zone_client.py
index 905ebdc..bb4a357 100644
--- a/tempest/services/volume/v2/json/availability_zone_client.py
+++ b/tempest/services/volume/v2/json/availability_zone_client.py
@@ -13,9 +13,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_availability_zone_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class AvailabilityZoneClient(
-        base_availability_zone_client.BaseAvailabilityZoneClient):
+class AvailabilityZoneClient(rest_client.RestClient):
     api_version = "v2"
+
+    def list_availability_zones(self):
+        resp, body = self.get('os-availability-zone')
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)
diff --git a/tempest/services/volume/v2/json/extensions_client.py b/tempest/services/volume/v2/json/extensions_client.py
index 245906f..09279d5 100644
--- a/tempest/services/volume/v2/json/extensions_client.py
+++ b/tempest/services/volume/v2/json/extensions_client.py
@@ -13,8 +13,18 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest.services.volume.base import base_extensions_client
+from oslo_serialization import jsonutils as json
+
+from tempest.lib.common import rest_client
 
 
-class ExtensionsClient(base_extensions_client.BaseExtensionsClient):
+class ExtensionsClient(rest_client.RestClient):
+    """Volume V2 extensions client."""
     api_version = "v2"
+
+    def list_extensions(self):
+        url = 'extensions'
+        resp, body = self.get(url)
+        body = json.loads(body)
+        self.expected_success(200, resp.status)
+        return rest_client.ResponseBody(resp, body)