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Persistent brake squeal on 2019 Audi A3 1.8T, even after new pads and rotors

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Mike T. · rep 0 · May 26, 3:51 AM · 1 replies · solved · Question

Vehicle: 2019 Audi A3 1.8T Premium

Hi everyone,

I'm at my wit's end with a persistent, loud brake squeal on my 2019 Audi A3 1.8T Premium. It happens mainly at low speeds, especially when I'm lightly applying the brakes, and it's particularly bad when the car is cold or after it's been sitting for a bit. It's embarrassing!

I recently had the front pads and rotors replaced at an independent shop, and they assured me they used quality parts and followed proper procedures, including using anti-squeal compound. Yet, the noise is still there, just as loud as before.

Is this a common characteristic of the A3's braking system? What else could be causing this? I'm wondering if there's something specific to Audi brakes that needs to be addressed beyond just replacing the components. Any advice on how to finally get rid of this noise would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 26, 3:51 AM

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ClearTheCode admin answer:

Persistent brake squeal, especially after new pads and rotors have been installed, can be incredibly frustrating. While some degree of noise can be normal with certain high-performance or metallic brake compounds, constant loud squealing on your 2019 Audi A3 1.8T Premium indicates an underlying issue. Here’s what to consider:

  1. Bedding-in Process: Ensure the new pads and rotors were properly 'bedded-in.' This involves a specific procedure of moderate braking followed by cooling to transfer a layer of pad material onto the rotor, which helps prevent noise and optimizes performance. If this wasn't done, or done incorrectly, it can lead to squealing.
  2. Pad Material: Some aftermarket brake pads, particularly those with a higher metallic content, are known to be noisier than OEM (Original Equipment Manufacturer) pads. While they might offer better performance, they often come with increased noise. If the shop used non-OEM pads, this could be a factor.
  3. Installation Issues:
    • Anti-Squeal Shims/Compound: Even if applied, improper application or missing shims can cause noise. Ensure all necessary shims were installed and that anti-squeal lubricant was applied to the backs of the pads and caliper contact points.
    • Caliper Pins/Hardware: Sticking or improperly lubricated caliper guide pins, or worn/bent hardware (clips, springs), can cause the pads to vibrate and squeal. The calipers themselves should also be inspected for proper function.
    • Rotor Runout: Even new rotors can have slight imperfections. Excessive rotor runout (wobble) can cause vibrations that lead to squealing.
  4. Dust Shields: Less common, but sometimes a bent dust shield can rub against the rotor, creating a squealing sound.

Common Causes:

  • Improper bedding-in of new components.
  • Type of brake pad material (aftermarket vs. OEM).
  • Improper installation, including missing shims or insufficient lubrication.
  • Sticking caliper components or worn hardware.

When to See a Shop: Since you've already had the pads and rotors replaced, it's best to return to the shop that performed the work. Explain the persistent squeal and ask them to re-inspect the entire braking system, focusing on the points above. They should check for proper installation, caliper function, and rotor runout. If the issue cannot be resolved, consider having an Audi specialist or another reputable independent shop diagnose the problem, as they might identify something overlooked during the initial service.

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