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2017 Audi A4 B9 - Squeaky Brakes & Vibration After Pad/Rotor Replacement

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Chris P. · rep 0 · May 25, 3:13 AM · 1 replies · solved · Question

Vehicle: 2017 Audi A4 B9 2.0T Quattro

Hey everyone, I'm having a persistent issue with my 2017 Audi A4 B9, 2.0T Quattro. I recently had all four brake pads and rotors replaced by an independent shop about 500 miles ago. Ever since, I've noticed a really annoying squeak, especially at low speeds or when coming to a gentle stop. It's not constant, but frequent enough to be concerning.

On top of that, I'm feeling a slight vibration through the pedal and steering wheel when braking from higher speeds, say 50 mph down to 20 mph. It wasn't there before the brake job. The shop says they used quality aftermarket parts and everything was installed correctly, but I'm not convinced. Any ideas what could be causing this?

Could it be improper bedding-in, or something more serious like warped new rotors already? I'm worried about the long-term effects if this isn't resolved soon.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:13 AM

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ClearTheCode admin answer:

It sounds like you're experiencing a common set of issues after a brake service. Here's a breakdown of potential causes and steps to take:

  1. Improper Bedding-In: This is often the primary culprit for squealing and sometimes vibration. New pads and rotors need to be properly bedded-in to transfer a thin layer of friction material from the pads to the rotors, ensuring optimal performance and quiet operation. If this wasn't done or done incorrectly, it can lead to noise and uneven braking.

    • Action: Look up proper brake bedding procedures for your specific pads (often involves a series of moderate and firm stops without coming to a complete halt, followed by cooling). If the issue persists, the rotors might need to be re-bedded or, in worst-case scenarios, resurfaced or replaced if uneven wear has already occurred.

  2. Uneven Rotor Runout/Warping: While new rotors shouldn't warp quickly, improper installation (e.g., not thoroughly cleaning the hub surface before mounting the new rotor) or overtightening wheel bolts unevenly can cause the rotor to sit slightly off-kilter, leading to vibration. Even minor runout can cause a noticeable pulsation.

    • Action: Have the shop check the rotor runout with a dial indicator. If it's out of spec, the rotors may need to be replaced or machined.

  3. Brake Pad Material/Quality: Some aftermarket pads are known to be noisier than OEM, especially if they are performance-oriented. If the shop used a very aggressive pad compound, squealing can be more prevalent.

    • Action: Inquire about the specific brand and type of pads used. If they are known for noise, switching to a different compound might be necessary.

  4. Brake Caliper Issues: A sticking caliper piston or slide pins can cause uneven pad wear, leading to squealing and vibration. This is less likely if it started immediately after the service, but worth checking.

    • Action: Ensure the caliper slide pins were properly lubricated and the calipers are functioning freely.

When to see a shop: It's crucial to have the shop re-evaluate their work. Specifically, ask them to:

  • Inspect for proper installation of all brake components.
  • Check for rotor runout on all four wheels.
  • Verify that the caliper slide pins are free and properly lubricated.
  • Confirm the brake fluid level and condition.

If the vibration worsens or you notice any changes in braking performance, do not delay in having it inspected, as braking system issues can compromise safety. An OBD-II scan might reveal codes related to ABS or traction control if a wheel speed sensor was disturbed, but for mechanical squeal/vibration, visual inspection and measurement are key.

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