A very specific brake noise - a squeak during light braking that vanishes when you press the pedal harder - has a specific, usually harmless explanation. Here is what it means.
It is pad vibration
Light braking lets the pad vibrate against the rotor at a high frequency you hear as a squeak; pressing harder clamps the pad solidly so it cannot vibrate, and the noise stops; see why brakes squeak. This on-off-with-pressure pattern is the classic vibration signature.
Common and usually harmless
This is especially common with harder pad compounds, in damp conditions, or at low speed; see low-speed noise. It does not mean the brakes are failing - the pads still have material and work fine.
How to reduce it
Fresh anti-rattle hardware, pad shims, and proper lubrication of the contact points damp the vibration; see why brakes squeak. Quality pads with chamfers and shims squeak less than bargain pads.
When to look closer
If the noise becomes a grind, or a squeal that does NOT stop under pressure, that is different - check the pads and caliper. But a light squeak that quiets when you press harder is usually just cosmetic. Fit quality pads and hardware.