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2018 Macan S - Persistent Brake Squeal and Occasional ABS Light

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Mike T. · rep 0 · May 25, 4:50 AM · 1 replies · solved · Question

Vehicle: 2018 Porsche Macan S

Hey everyone, I've got a 2018 Porsche Macan S with about 45k miles on it. Lately, I've been experiencing a really annoying, persistent squeal from the brakes, especially at low speeds or when coming to a gentle stop. It's not just a quick squeak, it's quite loud and consistent.

On a few occasions, the ABS warning light has also flickered on for a few seconds before turning off again. This usually happens after hitting a small bump or during light braking. I had the pads and rotors replaced about 10k miles ago with OEM parts.

Could this be a sensor issue, or something more serious with the ABS module? I'm worried about driving it like this, especially with the intermittent ABS light. Any thoughts or similar experiences?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 4:50 AM

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ClearTheCode admin answer:

Persistent brake squeal combined with an intermittent ABS light on your 2018 Porsche Macan S suggests a few potential issues that warrant immediate attention.

  1. Causes of Squealing Brakes:

    • Pad Glazing: Even new pads can glaze over, especially if not properly bedded in or if subjected to excessive heat. This hardens the pad surface, leading to squealing.
    • Anti-Squeal Shims: Missing or improperly installed anti-squeal shims or paste can cause metal-on-metal vibration, resulting in noise.
    • Uneven Pad Wear/Rotor Runout: If rotors aren't perfectly flat or if pads are wearing unevenly, it can cause noise.
    • Contamination: Oil, grease, or brake fluid on the pads or rotors can cause squealing.
    • Low Quality Pads: While you mentioned OEM, sometimes even new pads can be defective.

  2. Causes of Intermittent ABS Light:

    • Wheel Speed Sensor: This is the most common culprit. A faulty, dirty, or damaged wheel speed sensor (or its wiring) can send incorrect signals to the ABS module, causing the light to illuminate. This can also be exacerbated by bumps.
    • ABS Module Fault: Less common, but the ABS control module itself could be failing.
    • Low Brake Fluid: Extremely low fluid can sometimes trigger brake warning lights, though usually not specifically ABS.
    • OBD Codes: A diagnostic scan will likely reveal codes such as C0031-C0035 (Wheel Speed Sensor related), or U0401 (Invalid Data Received from ECM/PCM A) if there's a communication issue.

  3. When to See a Shop:

    • You should get your Macan S inspected by a qualified Porsche specialist immediately. The intermittent ABS light indicates a potential compromise in your braking system's safety features.
    • The shop will perform a diagnostic scan to retrieve any stored ABS or brake system fault codes.
    • They will inspect all four wheel speed sensors, their wiring, and connections for damage or contamination.
    • A thorough brake inspection will include checking pad wear, rotor condition (for runout and glazing), caliper function, and proper installation of all brake components.
    • Do not delay this inspection, as a compromised ABS system can increase stopping distances and reduce vehicle control in emergency braking situations.
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