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Brake fluid flush for 2024 Polestar 3 - EV specific maintenance?

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Mike T. · rep 0 · May 25, 5:24 AM · 1 replies · solved · Question

Vehicle: 2024 Polestar 3 Long Range

I'm planning ahead for maintenance on my new 2024 Polestar 3 Long Range. I know EVs use regenerative braking extensively, which means the friction brakes aren't used as often as in a traditional car. Does this change the recommendations for brake fluid flushes?

What's the typical interval for a brake fluid flush on a Polestar EV? Is it still every couple of years, or can it be extended? Also, are there any special considerations for the type of brake fluid or the procedure itself for an EV?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:24 AM

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ClearTheCode admin answer:

You're right to consider the unique aspects of EV braking systems! While regenerative braking significantly reduces wear on friction components (pads and rotors), the brake fluid itself still requires regular maintenance, though the intervals might be slightly different or interpreted differently than for an ICE vehicle.

Brake Fluid Function and Degradation:

Brake fluid is hygroscopic, meaning it absorbs moisture over time. This moisture lowers the fluid's boiling point, which can lead to vapor lock and brake fade under heavy braking. It also contributes to corrosion within the brake lines and components. This degradation process occurs regardless of how often the friction brakes are used.

Polestar 3 Brake Fluid Flush Intervals:

  1. Manufacturer Recommendations: Always refer to your 2024 Polestar 3 owner's manual for the precise recommended service interval. Typically, brake fluid flushes are recommended every 2-3 years, regardless of mileage, due to moisture absorption.
  2. EV Specifics: While regenerative braking reduces friction brake usage, the brake fluid still operates within the same sealed hydraulic system. The fluid's exposure to moisture through hoses and seals remains constant. Therefore, the need to flush due to moisture absorption is largely unchanged from traditional vehicles.

Type of Brake Fluid:

  • Polestar vehicles, like most modern cars, typically use DOT 4 brake fluid. Always confirm the specific type recommended in your owner's manual. Using an incorrect fluid can damage the brake system components.

Special Considerations for EVs (DIY vs. Shop):

  • Integrated Brake Systems: Modern EVs, including the Polestar 3, often have sophisticated integrated brake systems that combine hydraulic braking with regenerative braking, sometimes managed by a brake-by-wire system. This can make DIY brake fluid flushes more complex.
  • Diagnostic Tools: Proper bleeding of these systems may require a diagnostic tool to cycle the ABS pump or open specific valves, which is typically only available at a dealership or specialized independent shop.
  • Safety: Brake fluid is corrosive to paint and plastics. Always wear appropriate personal protective equipment (gloves, eye protection).

When to See a Shop:

  • Recommended for Polestar 3: Due to the complexity of modern EV brake systems, it is highly recommended to have a brake fluid flush performed by a certified Polestar service center or an experienced EV technician. They have the necessary equipment to perform the flush correctly and safely, ensuring the integrity of your braking system.
  • Warning Lights: If you ever see a brake system warning light, seek immediate professional service.
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