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2018 A4 Brakes Squealing - What's going on?

0

Mike T. · rep 0 · May 25, 3:13 AM · 1 replies · solved · Question

Vehicle: 2018 Audi A4 Premium Plus

Hey everyone, I've got a 2018 Audi A4 Premium Plus with about 55k miles on it. Lately, I've noticed a really annoying squealing sound every time I apply the brakes, especially when they're cold or after the car has been sitting for a bit. It's not a constant grind, more of a high-pitched squeal.

It seems to happen at lower speeds, like when I'm coming to a stop sign or in traffic. Once I'm on the highway, it's not noticeable. I don't feel any pulsing in the pedal, and the car still stops fine, but the sound is definitely getting louder and more frequent.

Any ideas what might be causing this? Is it just normal wear and tear, or something I should be more concerned about? Thanks for any help!

✓ Accepted solution

ClearTheCode Admin

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

0

ClearTheCode admin answer: Squealing brakes are a common concern and can be caused by several factors, ranging from normal wear to issues requiring attention.

  1. Causes of Squealing Brakes:

    • Brake Pad Wear Indicators: Most Audi brake pads have metal wear indicators that make a high-pitched squeal when the pads are nearing the end of their life. This is a common and intended warning.
    • Glazed Brake Pads/Rotors: If pads or rotors get excessively hot, their surfaces can harden or 'glaze,' leading to squealing. This often happens with aggressive braking or after new pads haven't been properly bedded in.
    • Contamination: Dirt, dust, road salt, or even brake fluid/grease on the pads or rotors can cause noise.
    • Improper Lubrication: Lack of proper lubrication on caliper slide pins or the back of the brake pads where they contact the caliper can lead to vibrations and squealing.
    • Rust: Surface rust on rotors, especially after rain or washing, can cause temporary squealing until it's worn off by braking.

  2. What You Can Do (Initial Check):

    • Visually inspect your brake pads through the wheel spokes. If the pad material looks very thin (less than 3-4mm), it's likely time for replacement.
    • Note if the squealing is worse after the car has been sitting or in damp conditions, which might point to surface rust.

  3. When to See a Shop:

    • If the squealing is persistent, loud, and doesn't go away after a few brake applications.
    • If you notice any other symptoms like a soft pedal, pulling to one side, or vibrations.
    • If your visual inspection shows very thin pads or unusual wear on the rotors.
    • A professional can accurately diagnose pad thickness, rotor condition, and ensure caliper components are functioning correctly. Ignoring persistent brake noise can lead to more costly repairs or reduced braking performance.
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