Squealing only when cold or constantly - what's the difference?

If the noise disappears once the brake is warm, it's typical of a sport compound below its temperature window - normal and uncritical. If it squeals constantly and shrilly even when warm, it's worth looking at wear indicators, missing shims, loose retaining springs or dirty guides. Constant metallic grinding, by contrast, is a wear signal, not a compound issue.

Does the squealing harm the brake?

The squealing itself does not - it's a vibration, not material damage, and costs no braking performance. Only the cause behind it becomes harmful, if it's a worn pad or a loose component, for example. As long as compound and hardware are in order, you may find the noise acoustically annoying, but technically it's harmless.

Brakes squealing? Causes with sport brake pads & remedies

Sport brake pads squealing: causes and what helps

Why do brakes squeal, especially with sport brake pads? Squealing is usually a high-frequency vibration between pad and brake disc - and physically more normal with harder sport compounds than with soft production pads. What causes lie behind it and what helps against brake squeal you can read here.

Why sport brake pads tend to squeal more

Sport and race compounds are harder and contain different friction materials than soft production pads. This hardness is intended: it brings more coefficient of friction and heat resistance. The flip side is a higher tendency to noise, because the hard pad tends to vibrate at high frequency with the disc.

Squealing is therefore not a defect, but often a normal accompanying phenomenon of high-performance pads. It says nothing about braking performance.

Common causes of brake squeal

Hard sport/race compound (more noise-prone by design).
Pads not bedded in or poorly bedded in without a clean transfer layer.
Missing or worn anti-squeal measures (shims, pad paste on the backs).
Cold brake: sport pads are louder below their temperature window.
Vibrations from loose pad retaining springs or dirty guides.

What helps against the squealing

The first effective step is clean bedding-in, so an even transfer layer forms. Anti-squeal paste on the pad backing plates - Endless Anti Quietsch, for example - and intact shims damp the vibrations. Clean dirty caliper guides and fit the retaining springs correctly.

If you value silence over maximum heat resistance, you can also pick a somewhat more civil compound - Endless MX87 instead of a pure race pad, say, for predominantly road use.

Frequently asked questions

Squealing only when cold or constantly - what's the difference?: If the noise disappears once the brake is warm, it's typical of a sport compound below its temperature window - normal and uncritical. If it squeals constantly and shrilly even when warm, it's worth looking at wear indicators, missing shims, loose retaining springs or dirty guides. Constant metallic grinding, by contrast, is a wear signal, not a compound issue.
Does the squealing harm the brake?: The squealing itself does not - it's a vibration, not material damage, and costs no braking performance. Only the cause behind it becomes harmful, if it's a worn pad or a loose component, for example. As long as compound and hardware are in order, you may find the noise acoustically annoying, but technically it's harmless.

Next step

Choose a vehicle, then see matching brakes

Enter the HSN/TSN from your registration document (fields 2.1 and 2.2) or search by make and model.

All articles in the knowledge base