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Persistent Squealing Brakes on my 2018 A4

0

Ashley M. · rep 0 · May 22, 4:25 AM · 1 replies · solved · Question

Vehicle: 2018 Audi A4 Premium Plus

Hey everyone,

I've been noticing a really annoying, high-pitched squeal coming from my brakes, especially at low speeds or when coming to a gentle stop. It's a 2018 Audi A4 Premium Plus with about 45,000 miles on it.

I had the pads and rotors replaced about 10,000 miles ago, so I'm a bit stumped. It's not constant, but frequent enough to be embarrassing. Is this a common Audi thing, or should I be worried about something more serious? Any ideas on what might be causing it?

Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:25 AM

0

ClearTheCode admin answer:

Persistent brake squealing, even after recent pad and rotor replacement, can be frustrating. Here's a breakdown of common causes and what to do:

  1. Causes of Brake Squeal:

    • Improper Pad Bedding: New pads need to be properly 'bedded-in' to the rotors. If this wasn't done correctly, it can lead to noise.
    • Cheap or Incorrect Pads: Some aftermarket pads, especially metallic ones, are prone to squealing. Ensure you're using quality pads suitable for your Audi.
    • Anti-Squeal Shims/Grease: Brake pads typically come with anti-squeal shims, and the back of the pads should have a thin layer of high-temperature brake grease applied during installation. If these are missing or improperly applied, squealing can occur.
    • Rotor Glazing: If the rotors have developed a hard, shiny surface (glazing), it can cause noise. This often happens from excessive heat or improper braking habits.
    • Dust and Debris: Accumulation of brake dust or small debris between the pad and rotor can also cause noise.
    • Caliper Issues: A sticking caliper piston or slide pins can cause uneven pad wear and noise.
    • Pad Wear Indicators: While you mentioned recent replacement, sometimes the wear indicators can be faulty or prematurely trigger.

  2. Troubleshooting Steps:

    • Visual Inspection: Carefully inspect the pads and rotors for any obvious signs of uneven wear, scoring, or foreign objects.
    • Re-bedding Brakes: Try performing a proper brake bedding procedure. This usually involves several hard stops from moderate speeds (e.g., 60-10 mph) without coming to a complete stop, allowing the brakes to cool between runs. Consult your pad manufacturer's instructions.
    • Clean and Lubricate: If comfortable, remove the wheels and calipers, clean the caliper slide pins, and re-lubricate them with appropriate high-temperature brake grease. Ensure anti-squeal shims are present and correctly installed.

  3. When to See a Shop:

    • If the squealing persists after attempting re-bedding and visual inspection.
    • If you notice any changes in braking performance, such as a soft pedal, pulling to one side, or reduced stopping power.
    • If you're uncomfortable performing the inspection or maintenance yourself. A professional can properly diagnose caliper issues, rotor runout, or other underlying problems. Ignoring persistent brake noise can lead to premature wear or safety concerns.
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