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Persistent Squealing Brakes on my 2018 XC90

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Steve N. · rep 0 · May 22, 5:12 AM · 1 replies · solved · Question

Vehicle: 2018 Volvo XC90 T6 Momentum

Hey everyone,

I've been noticing a really annoying squealing sound from the brakes on my 2018 Volvo XC90 T6 Momentum. It's most prominent when I'm braking lightly, especially after the car has been sitting for a while or first thing in the morning. It seems to lessen a bit once the brakes warm up, but it never completely goes away.

I had the pads and rotors checked about 6 months ago, and they said everything looked fine. Is this just a common Volvo thing, or should I be worried? I'm at about 65,000 miles now.

Any thoughts or similar experiences would be greatly appreciated!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:12 AM

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ClearTheCode admin answer:

Squealing brakes can be a common issue, but it's important to diagnose the root cause. Here's a breakdown of potential issues and steps:

  1. Causes of Squealing Brakes:

    • Pad Wear Indicators: Most brake pads have a small metal tab that scrapes against the rotor when the pads are worn down, producing a high-pitched squeal. Even if checked 6 months ago, depending on driving habits, they could be nearing their limit.
    • Glazed Rotors/Pads: If brakes are frequently overheated or used lightly, the surface of the pads or rotors can become glazed, leading to squealing.
    • Contamination: Oil, grease, or brake fluid on the pads or rotors can cause squealing.
    • Improper Installation: If brake components weren't installed correctly (e.g., missing anti-squeal shims, insufficient lubrication on caliper pins), it can lead to noise.
    • Low-Quality Pads: Some aftermarket pads are known to be noisier than OEM parts.
    • Rust/Corrosion: Surface rust on rotors, especially after rain or sitting, can cause initial squeal that usually dissipates quickly.
    • Vibration: Caliper components or pads vibrating against each other can create noise. Anti-squeal shims or brake grease on the back of the pads help dampen this.

  2. When to See a Shop:

    • Persistent Squeal: If the squealing is constant and doesn't go away after the brakes warm up, it warrants immediate inspection.
    • Reduced Braking Performance: Any noticeable decrease in stopping power or a spongy pedal accompanying the squeal is a critical safety concern.
    • Grinding Noise: A grinding sound indicates metal-on-metal contact, meaning your pads are completely worn and the rotors are being damaged. Stop driving immediately and get it towed.
    • Vibration/Pulsation: If you feel vibration in the pedal or steering wheel, it could indicate warped rotors, which also need professional attention.

For your 2018 XC90, given the mileage and persistence, it's highly recommended to have a qualified technician perform a thorough brake inspection. They will check pad thickness, rotor condition, caliper function, and ensure all components are properly lubricated and installed. They can also clean and deglaze the components if necessary.

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