2021 Polestar 1 Brakes
Activating and deactivating Auto-hold at a standstill
The Auto-hold brake function at a standstill is activated with the button in the tunnel console.
- Press the button in the tunnel console to activate or deactivate the function.
> The indicator light in the button will illuminate when the function is activated. The function will remain active the next time the vehicle is started.
When shutting off
If the function is active and holding the vehicle stationary using the normal brakes (a symbol lit in the instrument panel), the brake pedal must be depressed while pressing the button in order to deactivate Auto-hold.
- The function will remain off until it is reactivated.
- When Auto-hold is switched off, Hill Start Assist (HSA) will remain active to help prevent the vehicle from rolling backward when starting up a hill.
Auto-hold brakes
- With the Auto-hold brake function, the driver can release the brake pedal and the brakes will remain applied, for example, when the vehicle has stopped at a traffic light or intersection.
- When the vehicle stops, the brakes are activated automatically. The function can use either the normal brakes or the parking brakes to keep the vehicle stationary and works on flat surfaces or hills. If the driver has their seat belt fastened or if the driver’s door is closed, the brakes will disengage automatically when the vehicle starts driving.
NOTE
When braking to a stop on an uphill or downhill gradient, depress the brake pedal with slightly more force than usual before releasing to ensure that the vehicle cannot move at all.
The parking brake is activated if
- the vehicle is switched off
- the driver’s door is opened
- the driver’s seat belt is removed
- the vehicle has been stationary for a prolonged period of time (5-10 minutes)
Symbols in the instrument panel
| Symbol | Meaning |
|---|---|
 |
This symbol illuminates when the function is using the normal brakes to keep the vehicle stationary. |
|
This symbol illuminates when the function is using the parking brake to keep the vehicle stationary. |
Brake fluid specifications
The medium in the hydraulic brake system is called brake fluid and is used to transfer braking force from e.g. pressure on the brake pedal via a master brake cylinder to one or more slave cylinders, which in turn act on a mechanical brake.
Recommended grade: Polestar Original or similar fluid that meets a combination of Dot 4, 5.1 and ISO 4925 class 6.
NOTE
Changing or filling brake fluid should be entrusted to an authorized workshop.
Brake functions
- The vehicle’s brakes are used to reduce speed or prevent the vehicle from rolling.
- In addition to the wheel brakes and parking brakes, the vehicle is also equipped with a number of automatic brake assist functions. These systems help the driver by e.g. keeping the vehicle stationary when the brake pedal is not depressed (e.g. at a traffic light or intersection) or when starting up a hill.
Depending on how the vehicle is equipped, the following brake assist functions may be included:
- Auto-hold brake function at a standstill (Auto Hold)
- Hill Start Assist (Hill Start Assist)
- Braking assist after a collision
- City Safety
Braking assist after a collision
- In a collision in which the activation level is reached for the pyrotechnic seat belt tensioners or airbags, or if a collision with a large animal is detected, the vehicle’s brakes will be automatically activated. This function is intended to help prevent or reduce the effects of any subsequent collision.
- After a serious collision, it may no longer be possible to control and steer the vehicle. In order to avoid or mitigate a possible further collision with a vehicle or an object in the vehicle’s path, the brake assist system is activated automatically to help stop the vehicle safely.
- The brake lights and hazard warning flashers are activated during braking. When the vehicle has stopped, the hazard warning flashers will continue to flash and the parking brake will be applied.
- If braking is not appropriate, e.g. if there is a risk of being hit by passing traffic, the driver can override the system by depressing the accelerator pedal.
- This function assumes that the brake system is intact after a collision.
Hill Start Assist
- The function for assisting when starting the vehicle on inclines (HSA) helps prevent the vehicle from rolling backward when starting on an uphill gradient. When backing up a hill, HSA helps prevent the vehicle from rolling forward.
- The function retains pressure from the brake pedal in the brake system for several seconds after the brake pedal has been released.
- This temporary braking effect is released after a few seconds or when the driver begins driving.
- Hill Start Assist is available even when the Auto-hold brake function is switched off.