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Clunking/Groaning Noise from Brakes on my 2022 Polestar 2

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Mike T. · rep 0 · May 22, 7:45 AM · 1 replies · solved · Question

Vehicle: 2022 Polestar 2 Long Range Dual Motor

Hey everyone,

I've been noticing a strange clunking or groaning noise coming from the brakes on my 2022 Polestar 2, Long Range Dual Motor. It's most noticeable at low speeds, especially when I'm coming to a complete stop or just starting to move. Sometimes it happens when switching between regenerative braking and the friction brakes.

It's not a constant squeal, more like a single 'clunk' or a low 'groan' sound. I've only had the car for about a year and a half, and it's got around 25,000 miles on it. I live in a fairly flat area, so it's not like I'm constantly riding the brakes on hills.

Has anyone else experienced this with their Polestar 2? Is this a known issue, or something I should be seriously concerned about? I'm wondering if it's just normal wear and tear or something more significant with the braking system.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 7:45 AM

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ClearTheCode admin answer:

This clunking or groaning noise from your 2022 Polestar 2's brakes, especially at low speeds or during transitions between regenerative and friction braking, is a relatively common concern for EV owners. It often points to specific issues within the braking system.

Here's a breakdown of potential causes and what to do:

  1. Brake Pad Movement: EV brakes, due to heavy reliance on regenerative braking, are used less frequently than conventional car brakes. This can lead to brake pads slightly shifting within the caliper brackets, causing a 'clunk' as they reseat themselves when friction brakes engage. This is often more noticeable at low speeds.
  2. Caliper Pin Issues: The guide pins that allow the brake calipers to slide smoothly can become dry, corroded, or sticky. This can prevent the caliper from moving freely, leading to uneven pad wear or a clunking sound as the caliper 'catches' when braking.
  3. Rotor Surface Irregularities: Infrequent use can also lead to minor surface rust or uneven wear on the brake rotors. While regenerative braking handles most stopping, the friction brakes still need to engage, and irregularities can cause groaning or vibration.
  4. Brake Dust Accumulation: Excessive brake dust can build up between the pads and rotors or within the caliper assembly, contributing to noise.

When to See a Shop:

  • Immediate Inspection: If the noise is accompanied by a change in braking performance (e.g., reduced stopping power, a spongy pedal, or pulling to one side), or if you notice any warning lights on your dashboard (e.g., ABS, brake system warning), you should have your vehicle inspected by a qualified technician immediately. While this specific issue might not trigger an OBD code, a technician can check for any stored brake system fault codes.
  • Routine Maintenance: Even without warning lights, it's advisable to have your brakes inspected and serviced. A technician can clean and lubricate the caliper guide pins, inspect the pads for uneven wear, and check the rotors. This is often part of a routine brake service for EVs, even if the pads aren't worn down.

Addressing these issues proactively can prevent more significant brake problems down the line and ensure your Polestar 2's braking system operates safely and quietly.

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