Shopping for brake pads raises a simple but confusing question: how many come in a box, and how many do you need? Understanding pad packaging keeps you from buying too few or too many. Here is how it works.
A set covers one axle
A standard brake pad set contains four pads - enough for one axle (both left and right wheels, inner and outer pad on each). So one box does the front axle OR the rear axle. Each wheel uses two pads (one on each side of the rotor), so two wheels on an axle need four pads total.
Why you replace a full axle
You always replace pads as a complete axle set, never just one wheel - both sides must have equal friction so the car brakes straight and evenly; see front vs rear brake pads. Replacing one side would cause a pull and uneven wear. That is why pads are packaged four-to-a-box for one axle.
Front and rear are different
Front and rear pads are usually different shapes and sizes, so they come as separate part numbers - a front set and a rear set. Fronts wear faster and are often replaced more often - see why rear pads last longer. You may only need the front axle done, or both, depending on wear; check pad thickness, see when to replace pads.
What to order
For a front brake job, order one front pad set (four pads). Doing all four corners means a front set AND a rear set. Match them to your exact vehicle - pads are not universal, see are brake pads universal. Add fresh hardware with your brake pads.