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Persistent Brake Squeal on 2018 Macan S - New pads, still noisy!

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

Vehicle: 2018 Porsche Macan S

Hi everyone,

I'm tearing my hair out over a persistent brake squeal on my 2018 Macan S. I recently had all four pads and rotors replaced (about 2,000 miles ago) with what I thought were quality aftermarket parts. However, the squealing has returned, especially at low speeds and when coming to a gentle stop. It's incredibly annoying and frankly, embarrassing for a Porsche.

I've tried bedding them in properly after the replacement, but the noise just won't go away. Is there something specific about Macan brakes that makes them prone to this? Could it be the type of pads, or something else entirely? Any tips on how to finally silence these brakes would be a lifesaver!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Persistent brake squeal after a pad and rotor replacement on your 2018 Macan S is a common, albeit frustrating, issue. While Porsche brakes are high-performance, they can be susceptible to noise if certain procedures aren't followed or specific components aren't used.

Here are the most common causes and potential solutions:

  1. Improper Bedding-In:

    • Cause: If pads weren't properly bedded, material transfer to the rotor might be uneven, leading to vibrations and noise.
    • Solution: Re-attempt the bedding-in process. This typically involves several moderate stops from 60 mph to 10 mph, followed by a few harder stops, without coming to a complete stop, then driving to cool them down without braking.

  2. Pad Material/Quality:

    • Cause: Some aftermarket pads, especially performance-oriented ones, can be inherently noisier due due to their compound. Also, cheaper pads may lack proper anti-squeal shims.
    • Solution: Consider switching to OEM Porsche pads or high-quality aftermarket pads known for low noise. Ensure the pads have integral anti-squeal shims.

  3. Anti-Squeal Shims/Grease:

    • Cause: If the pads were installed without new shims, or if the back of the pads wasn't properly lubricated with high-temperature anti-squeal grease, vibrations can occur.
    • Solution: Remove the pads, clean the caliper contact points, and apply a thin layer of high-temperature ceramic brake grease to the back of the pads (where they contact the caliper pistons and hardware) and the edges of the shims.

  4. Caliper Issues:

    • Cause: Sticky caliper pistons or guide pins can cause uneven pad wear and vibrations.
    • Solution: Inspect the calipers. Ensure pistons retract smoothly and guide pins are clean and well-lubricated.

  5. Rotor Compatibility/Runout:

    • Cause: While less likely with new rotors, excessive runout (wobble) or an incompatible rotor surface can cause noise.
    • Solution: A mechanic can measure rotor runout with a dial indicator.

When to See a Shop: If you've tried re-bedding and applying anti-squeal grease without success, it's best to have a qualified mechanic inspect the brakes. They can properly diagnose issues like sticky calipers, excessive rotor runout, or incorrect pad installation. While squealing is usually not a safety issue, it's a sign that something isn't quite right.

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