GM: Revert noisy brake pressed signal (#24612)

* Revert "GM: Fix noisy brake pressed (#23712)"

This reverts commit dd76cfcf28.

* keep this

* same check, but don't clip CS.brake

* bump panda

* bump panda to master

panda

@@ -1 +1 @@
-Subproject commit 36c62afa0c170aa1b7a39bcae3316ffb844499e8
+Subproject commit 6d19b46ef525b0ae224e0bf7db71918e96f9be66

selfdrive/car/gm/carstate.py

@@ -28,10 +28,15 @@ class CarState(CarStateBase):
     ret.vEgoRaw = mean([ret.wheelSpeeds.fl, ret.wheelSpeeds.fr, ret.wheelSpeeds.rl, ret.wheelSpeeds.rr])
     ret.vEgo, ret.aEgo = self.update_speed_kf(ret.vEgoRaw)
     ret.standstill = ret.vEgoRaw < 0.01
-
     ret.gearShifter = self.parse_gear_shifter(self.shifter_values.get(pt_cp.vl["ECMPRDNL"]["PRNDL"], None))
-    ret.brakePressed = pt_cp.vl["ECMEngineStatus"]["Brake_Pressed"] != 0
+
+    # Brake pedal's potentiometer returns near-zero reading even when pedal is not pressed.
     ret.brake = pt_cp.vl["EBCMBrakePedalPosition"]["BrakePedalPosition"] / 0xd0
+    ret.brakePressed = pt_cp.vl["EBCMBrakePedalPosition"]["BrakePedalPosition"] >= 10
+
+    # Regen braking is braking
+    if self.car_fingerprint == CAR.VOLT:
+      ret.brakePressed = ret.brakePressed or pt_cp.vl["EBCMRegenPaddle"]["RegenPaddle"] != 0
 
     ret.gas = pt_cp.vl["AcceleratorPedal2"]["AcceleratorPedal2"] / 254.
     ret.gasPressed = ret.gas > 1e-5
@@ -64,10 +69,6 @@ class CarState(CarStateBase):
     ret.espDisabled = pt_cp.vl["ESPStatus"]["TractionControlOn"] != 1
     ret.accFaulted = pt_cp.vl["AcceleratorPedal2"]["CruiseState"] == AccState.FAULTED
 
-    # Regen braking is braking
-    if self.car_fingerprint == CAR.VOLT:
-      ret.brakePressed = ret.brakePressed or pt_cp.vl["EBCMRegenPaddle"]["RegenPaddle"] != 0
-
     ret.cruiseState.enabled = pt_cp.vl["AcceleratorPedal2"]["CruiseState"] != AccState.OFF
     ret.cruiseState.standstill = pt_cp.vl["AcceleratorPedal2"]["CruiseState"] == AccState.STANDSTILL
 
@@ -101,7 +102,6 @@ class CarState(CarStateBase):
       ("TractionControlOn", "ESPStatus"),
       ("EPBClosed", "EPBStatus"),
       ("CruiseMainOn", "ECMEngineStatus"),
-      ("Brake_Pressed", "ECMEngineStatus"),
     ]
 
     checks = [