Persistent Squealing Brakes on my 2018 Audi A4

ClearTheCode admin answer:

Persistent brake squeal can be frustrating, but it's a common issue with several potential causes. Here's a breakdown of what might be happening and what to do:

1. Pad Wear Indicators: Many Audi models have wear indicators that trigger a squeal when pads are low. Even if they were fine 10k miles ago, they might be due now, especially if you do a lot of city driving.
2. Rotor Condition: Rotors can develop a lip or uneven surface over time. If the rotors are worn or have slight imperfections, they can cause vibrations that manifest as squealing. Sometimes, a simple resurfacing (if within spec) or replacement is needed.
3. Brake Dust and Glazing: Accumulation of brake dust or glazing on the pads/rotors can cause noise. This is often more noticeable in performance-oriented vehicles. A good cleaning and possibly chamfering the pad edges can help.
4. Caliper Issues: A sticking caliper piston or slide pins can cause uneven pad wear and constant contact, leading to squealing. This can also reduce braking efficiency over time.
5. Anti-Squeal Shims: If these shims are missing, damaged, or improperly installed, they won't dampen vibrations effectively, leading to noise.

When to see a shop:

• If the squealing is accompanied by grinding, pulsing, or a noticeable change in braking performance.
• If you suspect caliper issues or uneven pad wear.
• If a visual inspection doesn't reveal obvious issues like low pads.
• It's always best to have a qualified technician inspect your braking system to ensure safety and proper function. They can accurately diagnose the cause and recommend the correct repair, whether it's new pads, rotors, or caliper service.