diff --git a/tempest/api/compute/admin/test_servers_negative.py b/tempest/api/compute/admin/test_servers_negative.py
index 1283629..6364234 100644
--- a/tempest/api/compute/admin/test_servers_negative.py
+++ b/tempest/api/compute/admin/test_servers_negative.py
@@ -47,16 +47,6 @@
                                         wait_until='ACTIVE')
         cls.s1_id = server['id']
 
-    def _get_unused_flavor_id(self):
-        flavor_id = data_utils.rand_int_id(start=1000)
-        while True:
-            try:
-                self.flavors_client.show_flavor(flavor_id)
-            except lib_exc.NotFound:
-                break
-            flavor_id = data_utils.rand_int_id(start=1000)
-        return flavor_id
-
     @decorators.idempotent_id('28dcec23-f807-49da-822c-56a92ea3c687')
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize not available.')
@@ -64,8 +54,6 @@
     def test_resize_server_using_overlimit_ram(self):
         # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
         self.useFixture(fixtures.LockFixture('compute_quotas'))
-        flavor_name = data_utils.rand_name("flavor")
-        flavor_id = self._get_unused_flavor_id()
         quota_set = self.quotas_client.show_quota_set(
             self.tenant_id)['quota_set']
         ram = int(quota_set['ram'])
@@ -75,11 +63,7 @@
         ram += 1
         vcpus = 1
         disk = 5
-        flavor_ref = self.flavors_client.create_flavor(name=flavor_name,
-                                                       ram=ram, vcpus=vcpus,
-                                                       disk=disk,
-                                                       id=flavor_id)['flavor']
-        self.addCleanup(self.flavors_client.delete_flavor, flavor_id)
+        flavor_ref = self.create_flavor(ram=ram, vcpus=vcpus, disk=disk)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.client.resize_server,
                           self.servers[0]['id'],
@@ -92,8 +76,6 @@
     def test_resize_server_using_overlimit_vcpus(self):
         # NOTE(mriedem): Avoid conflicts with os-quota-class-sets tests.
         self.useFixture(fixtures.LockFixture('compute_quotas'))
-        flavor_name = data_utils.rand_name("flavor")
-        flavor_id = self._get_unused_flavor_id()
         quota_set = self.quotas_client.show_quota_set(
             self.tenant_id)['quota_set']
         vcpus = int(quota_set['cores'])
@@ -103,11 +85,7 @@
         vcpus += 1
         ram = 512
         disk = 5
-        flavor_ref = self.flavors_client.create_flavor(name=flavor_name,
-                                                       ram=ram, vcpus=vcpus,
-                                                       disk=disk,
-                                                       id=flavor_id)['flavor']
-        self.addCleanup(self.flavors_client.delete_flavor, flavor_id)
+        flavor_ref = self.create_flavor(ram=ram, vcpus=vcpus, disk=disk)
         self.assertRaises((lib_exc.Forbidden, lib_exc.OverLimit),
                           self.client.resize_server,
                           self.servers[0]['id'],
diff --git a/tempest/api/compute/servers/test_create_server.py b/tempest/api/compute/servers/test_create_server.py
index 5ddae5e..4af2c38 100644
--- a/tempest/api/compute/servers/test_create_server.py
+++ b/tempest/api/compute/servers/test_create_server.py
@@ -254,7 +254,6 @@
             self.flavor_ref)['flavor']
 
         def create_flavor_with_ephemeral(ephem_disk):
-            flavor_id = data_utils.rand_int_id(start=1000)
             name = 'flavor_with_ephemeral_%s' % ephem_disk
             flavor_name = data_utils.rand_name(name)
 
@@ -263,17 +262,10 @@
             disk = flavor_base['disk']
 
             # Create a flavor with ephemeral disk
-            flavor = self.flavor_client.create_flavor(
-                name=flavor_name, ram=ram, vcpus=vcpus, disk=disk,
-                id=flavor_id, ephemeral=ephem_disk)['flavor']
-            self.addCleanup(flavor_clean_up, flavor['id'])
-
+            flavor = self.create_flavor(name=flavor_name, ram=ram, vcpus=vcpus,
+                                        disk=disk, ephemeral=ephem_disk)
             return flavor['id']
 
-        def flavor_clean_up(flavor_id):
-            self.flavor_client.delete_flavor(flavor_id)
-            self.flavor_client.wait_for_resource_deletion(flavor_id)
-
         flavor_with_eph_disk_id = create_flavor_with_ephemeral(ephem_disk=1)
         flavor_no_eph_disk_id = create_flavor_with_ephemeral(ephem_disk=0)