diff --git a/selfdrive/car/gm/carstate.py b/selfdrive/car/gm/carstate.py
index ceaf43419bf765..14e14b32086c61 100644
--- a/selfdrive/car/gm/carstate.py
+++ b/selfdrive/car/gm/carstate.py
@@ -88,7 +88,7 @@ def __init__(self, CP, canbus):
                          K=[[0.12287673], [0.29666309]])
     self.v_ego = 0.
 
-  def update(self, pt_cp):
+  def update(self, pt_cp, ch_cp):
     self.prev_cruise_buttons = self.cruise_buttons
     self.cruise_buttons = pt_cp.vl["ASCMSteeringButton"]['ACCButtons']
     self.prev_lka_button = self.lka_button
@@ -173,7 +173,7 @@ def update(self, pt_cp):
     self.gear_shifter_valid = self.gear_shifter == car.CarState.GearShifter.drive
 
     # Update Friction Brakes from Chassis Canbus
-    #self.frictionBrakesActive = bool(ch_cp.vl["EBCMFrictionBrakeStatus"]["FrictionBrakePressure"] != 0)
+    self.frictionBrakesActive = bool(ch_cp.vl["EBCMFrictionBrakeStatus"]["FrictionBrakePressure"] != 0)
     
   def get_follow_level(self):
     return self.follow_level
diff --git a/selfdrive/car/gm/interface.py b/selfdrive/car/gm/interface.py
index f4254e2fbd3e87..13dd2a4e38f719 100755
--- a/selfdrive/car/gm/interface.py
+++ b/selfdrive/car/gm/interface.py
@@ -229,8 +229,8 @@ def get_params(candidate, fingerprint=gen_empty_fingerprint(), vin="", has_relay
   # returns a car.CarState
   def update(self, c, can_strings):
     self.pt_cp.update_strings(can_strings)
-
-    self.CS.update(self.pt_cp)
+    self.ch_cp.update_strings(can_strings)
+    self.CS.update(self.pt_cp, self.ch_cp)
 
     # create message
     ret = car.CarState.new_message()