diff --git a/bike-lights/bike/src/main.rs b/bike-lights/bike/src/main.rs
index 8bd6779..f8050b2 100644
--- a/bike-lights/bike/src/main.rs
+++ b/bike-lights/bike/src/main.rs
@@ -17,7 +17,7 @@ use rp_pico::{
     entry,
     hal::{
         clocks::init_clocks_and_plls,
-        gpio::{FunctionSio, Pin, PinId, PullUp, SioInput},
+        gpio::{FunctionSio, Pin, PinId, PullDown, PullUp, SioInput, SioOutput},
         pac::{CorePeripherals, Peripherals},
         spi::{Enabled, Spi, SpiDevice, ValidSpiPinout},
         watchdog::Watchdog,
@@ -65,12 +65,16 @@ struct BikeUI<
     RightId: PinId,
     PreviousId: PinId,
     NextId: PinId,
+    BrakeId: PinId,
 > {
     spi: RefCell<Spi<Enabled, D, P, 8>>,
     left_blinker_button: DebouncedButton<LeftId>,
     right_blinker_button: DebouncedButton<RightId>,
     previous_animation_button: DebouncedButton<PreviousId>,
     next_animation_button: DebouncedButton<NextId>,
+    brake_sensor: Pin<BrakeId, FunctionSio<SioInput>, PullUp>,
+
+    brake_enabled: bool,
 }
 
 impl<
@@ -80,7 +84,8 @@ impl<
         RightId: PinId,
         PreviousId: PinId,
         NextId: PinId,
-    > BikeUI<D, P, LeftId, RightId, PreviousId, NextId>
+        BrakeId: PinId,
+    > BikeUI<D, P, LeftId, RightId, PreviousId, NextId, BrakeId>
 {
     fn new(
         spi: Spi<Enabled, D, P, 8>,
@@ -88,6 +93,7 @@ impl<
         right_blinker_button: Pin<RightId, FunctionSio<SioInput>, PullUp>,
         previous_animation_button: Pin<PreviousId, FunctionSio<SioInput>, PullUp>,
         next_animation_button: Pin<NextId, FunctionSio<SioInput>, PullUp>,
+        brake_sensor: Pin<BrakeId, FunctionSio<SioInput>, PullUp>,
     ) -> Self {
         Self {
             spi: RefCell::new(spi),
@@ -95,6 +101,9 @@ impl<
             right_blinker_button: DebouncedButton::new(right_blinker_button),
             previous_animation_button: DebouncedButton::new(previous_animation_button),
             next_animation_button: DebouncedButton::new(next_animation_button),
+            brake_sensor,
+
+            brake_enabled: false,
         }
     }
 }
@@ -106,10 +115,17 @@ impl<
         RightId: PinId,
         PreviousId: PinId,
         NextId: PinId,
-    > UI for BikeUI<D, P, LeftId, RightId, PreviousId, NextId>
+        BrakeId: PinId,
+    > UI for BikeUI<D, P, LeftId, RightId, PreviousId, NextId, BrakeId>
 {
     fn check_event(&mut self, current_time: Instant) -> Option<Event> {
-        if self.left_blinker_button.is_low(current_time) {
+        if self.brake_sensor.is_high().unwrap_or(true) && !self.brake_enabled {
+            self.brake_enabled = true;
+            Some(Event::Brake)
+        } else if self.brake_sensor.is_low().unwrap_or(false) && self.brake_enabled {
+            self.brake_enabled = false;
+            Some(Event::BrakeRelease)
+        } else if self.left_blinker_button.is_low(current_time) {
             self.left_blinker_button.set_debounce(current_time);
             Some(Event::LeftBlinker)
         } else if self.right_blinker_button.is_low(current_time) {
@@ -197,6 +213,9 @@ fn main() -> ! {
     let right_blinker_button = pins.gpio16.into_pull_up_input();
     let previous_animation_button = pins.gpio27.into_pull_up_input();
     let next_animation_button = pins.gpio26.into_pull_up_input();
+    let brake_sensor = pins.gpio18.into_pull_up_input();
+
+    let mut led_pin = pins.led.into_push_pull_output();
 
     let ui = BikeUI::new(
         spi,
@@ -204,11 +223,11 @@ fn main() -> ! {
         right_blinker_button,
         previous_animation_button,
         next_animation_button,
+        brake_sensor,
     );
 
     let mut app = App::new(Box::new(ui));
 
-    let mut led_pin = pins.led.into_push_pull_output();
     led_pin.set_high();
 
     let mut time = Instant::default();