Brake Noise Explained: Why Your Brakes Squeal and How to Fix It
Few things are more annoying — or embarrassing — than squealing brakes. But brake noise isn’t always a sign of a problem. Here’s what causes it and how to fix it.
Common Causes of Brake Squeal
1. Vibration Between Pad and Rotor
The most common cause. At certain temperatures and pressures, the pad vibrates against the rotor at an audible frequency (typically 1-16 kHz). This is physics, not necessarily a defect.
2. Glazed Pads
When pads overheat or aren’t properly bedded in, the surface becomes glassy and smooth. This glazed surface vibrates more easily, causing persistent noise.
3. Worn Pads
Many modern pads include a metal wear indicator that creates a deliberate squeal when the pad reaches minimum thickness. This is a safety feature — replace your pads promptly.
4. Moisture and Morning Squeal
Light rust forms on rotors overnight. The first few brake applications scrape this off, causing a brief squeal. This is completely normal.
How to Eliminate Brake Noise
- Use quality pads with proper chamfering and anti-squeal shims
- Bed in pads correctly — see our bedding guide
- Apply brake grease to the back of pads and caliper contact points (never on friction surfaces)
- Check for glazing — lightly sand glazed surfaces with 200-grit sandpaper
- Ensure proper hardware — anti-rattle clips and shims must be installed correctly
At Barbaro CAC Racing, noise reduction is engineered into every pad. Our Street Pads feature chamfered edges, slotted surfaces, and integrated anti-squeal shims — the same attention to NVH (Noise, Vibration, Harshness) we apply to our racing products. Browse quiet brake pads →