You may see the term "burnishing" on a new pad box or in a service manual. It sounds technical, but it is just another word for bedding in your brakes - the break-in process that makes new pads and rotors work their best. Here is what burnishing means.
Burnishing = bedding in
Brake burnishing is a series of controlled, moderate stops from speed that seat fresh pads against the rotor and lay down an even transfer layer of friction material - the exact same thing as bedding in brake pads. Manufacturers use "burnish" as the formal term; DIYers usually say "bed in." Same process, same goal.
Why it matters
Without burnishing, new pads grip unevenly, feel weak or grabby, squeal, and are prone to a pulsation from uneven deposits - see brake judder. Properly burnished brakes are quiet, smooth, and reach full stopping power. It is the difference between a brake job that feels great and one that never quite settles.
How to burnish new brakes
Follow the pad maker's procedure - typically a series of moderate stops from around 35 mph, then a few firmer stops from higher speed, without coming to a full hard stop that leaves a deposit, and letting the brakes cool between. Do not park with hot brakes right after - see how to break in new rotors.
When it applies
Burnish any time you install new pads or rotors. Skipping it is a top cause of noise and judder complaints on an otherwise good brake job. Pair quality pads and rotors with fresh hardware and burnish them in for the best result.