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Persistent Brake Squeal and Steering Shudder on my Polestar 1

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Chris P. · rep 0 · May 25, 5:22 AM · 1 replies · solved · Question

Vehicle: 2020 Polestar 1

Hello Polestar community,

I'm reaching out about an annoying issue with my 2020 Polestar 1. For the past few months, I've been experiencing a persistent, high-pitched brake squeal, especially at low speeds and when coming to a stop. I had the pads replaced about 6 months ago, thinking that would solve it, but the squeal came back within a few weeks.

To make matters worse, I've also noticed a steering wheel shudder when I apply the brakes, particularly at highway speeds. It's not violent, but it's definitely noticeable and concerning. I love the car, but these issues are really detracting from the driving experience.

Has anyone with a Polestar 1, or even a Polestar 2, dealt with similar brake squeal or shudder? What was the culprit? I'm hoping to get some ideas before I take it to a specialist.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 5:22 AM

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ClearTheCode admin answer:

Persistent brake squeal and steering shudder are common complaints that can arise from several issues within the braking and suspension systems. Given your 2020 Polestar 1 has a high-performance braking system, precision is key.

Brake Squeal Causes:

  1. Pad Material/Bedding: Even new pads can squeal if they aren't properly bedded-in with the rotors, or if the pad compound is particularly aggressive (common in performance vehicles). Some pads are simply noisier than others.
  2. Improper Installation: If the pads or calipers weren't installed correctly, or if anti-squeal shims/lube weren't applied, squealing can occur. Old or worn shims can also be a culprit.
  3. Rotor Surface: A glazed or uneven rotor surface can cause squealing. Even if the pads are new, if the rotors weren't resurfaced or replaced, the old surface can induce noise.
  4. Caliper Issues: A sticky caliper piston or guide pin can cause the pad to drag unevenly, leading to noise and potentially premature wear.

Steering Shudder Causes:

  1. Warped Rotors: The most common cause of steering wheel shudder during braking is warped brake rotors. Uneven heating and cooling can cause the rotor surface to become non-uniform, leading to vibration when the pads contact them.
  2. Worn Suspension Components: Worn control arm bushings, ball joints, or tie rod ends can amplify vibrations from the brakes, making the shudder more pronounced.
  3. Wheel Imbalance/Alignment: While typically causing vibration at speed, a severe wheel imbalance or an alignment issue can sometimes be exacerbated during braking.

When to See a Shop:

  • Soon: Both persistent brake squeal and steering shudder during braking warrant a prompt inspection. While squealing is often an annoyance, it can sometimes indicate underlying issues. Steering shudder, especially from warped rotors, can affect braking efficiency and feel. A qualified technician should inspect:
    • Brake Rotors: Check for runout (warping) and thickness variation.
    • Brake Pads: Ensure correct installation, proper bedding, and adequate material.
    • Calipers: Check for sticking pistons or guide pins.
    • Suspension Components: Inspect all front-end suspension and steering components for wear or looseness.
  • Safety Note: Any significant change in braking performance or feel should be addressed immediately to ensure your safety and the longevity of your braking system. Given the Polestar 1's performance focus, maintaining optimal brake health is crucial.
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