diff --git a/packages/SystemUI/res/values/flags.xml b/packages/SystemUI/res/values/flags.xml
index 49f91096543af..8c6aba2f58da5 100644
--- a/packages/SystemUI/res/values/flags.xml
+++ b/packages/SystemUI/res/values/flags.xml
@@ -31,4 +31,6 @@
 
     <!-- AOD/Lockscreen alternate layout -->
     <bool name="flag_keyguard_layout">false</bool>
+
+    <bool name="flag_brightness_slider">false</bool>
 </resources>
diff --git a/packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessControllerSettings.java b/packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessControllerSettings.java
index 11ee94c97d7c0..8dcc8b46f0243 100644
--- a/packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessControllerSettings.java
+++ b/packages/SystemUI/src/com/android/systemui/settings/brightness/BrightnessControllerSettings.java
@@ -17,6 +17,7 @@
 package com.android.systemui.settings.brightness;
 
 import com.android.systemui.dagger.SysUISingleton;
+import com.android.systemui.statusbar.FeatureFlags;
 import com.android.systemui.util.settings.SecureSettings;
 
 import javax.inject.Inject;
@@ -28,11 +29,13 @@ import javax.inject.Inject;
 public class BrightnessControllerSettings {
 
     private static final String THICK_BRIGHTNESS_SLIDER = "sysui_thick_brightness";
+    private final FeatureFlags mFeatureFlags;
     private final boolean mUseThickSlider;
     private final boolean mUseMirrorOnThickSlider;
 
     @Inject
-    public BrightnessControllerSettings(SecureSettings settings) {
+    public BrightnessControllerSettings(SecureSettings settings, FeatureFlags featureFlags) {
+        mFeatureFlags = featureFlags;
         mUseThickSlider = settings.getInt(THICK_BRIGHTNESS_SLIDER, 0) != 0;
         mUseMirrorOnThickSlider = settings.getInt(THICK_BRIGHTNESS_SLIDER, 0) != 2;
     }
@@ -41,11 +44,11 @@ public class BrightnessControllerSettings {
     // restart systemui after changing it.
     /** */
     boolean useThickSlider() {
-        return mUseThickSlider;
+        return mUseThickSlider && mFeatureFlags.useNewBrightnessSlider();
     }
 
     /** */
     boolean useMirrorOnThickSlider() {
-        return mUseMirrorOnThickSlider;
+        return !useThickSlider() || (useThickSlider() && mUseMirrorOnThickSlider);
     }
 }
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java b/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
index 30b31580e1304..c54c45900b5dc 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/FeatureFlags.java
@@ -61,4 +61,9 @@ public class FeatureFlags {
     public boolean isKeyguardLayoutEnabled() {
         return mFlagReader.isEnabled(R.bool.flag_keyguard_layout);
     }
+
+    /** b/178485354 */
+    public boolean useNewBrightnessSlider() {
+        return mFlagReader.isEnabled(R.bool.flag_brightness_slider);
+    }
 }