Buy Brake Cleaner
The short answer
Brake cleaner is a routine stock item at national auto parts chains, including AutoZone. It is usually sold as an aerosol can on the chemicals or brake aisle. Single cans and multi-can cases are the two usual ways to buy it. No current prices, stock levels or case quantities were supplied for this article, so check the specific store or its online listing before you go.
Two things can change what you end up buying: whether you need a chlorinated or non-chlorinated formula, and whether your state restricts one of them. Settle those first, then choose between a single can and a case.
Chlorinated or non-chlorinated: the choice that matters most
Brake cleaner is a fast-evaporating solvent spray. It removes brake fluid, grease, oil and brake dust from rotors, calipers, drums and pads without leaving a residue. Formulas fall into two broad families, and labels normally say which one a can belongs to.
Chlorinated: uses chlorinated solvents such as tetrachloroethylene. It is generally non-flammable and cleans aggressively. Its vapors are hazardous, and heat or flame can break them down into toxic gases, including phosgene. Never use it near welding, grinding, open flames or hot surfaces. Non-chlorinated: uses solvents such as acetone, heptane or alcohols. It avoids the chlorinated-solvent hazards but is highly flammable. It may also evaporate a bit more slowly or clean less aggressively, depending on the product.
For most driveway brake jobs, a non-chlorinated cleaner is the common default, as long as you keep it away from ignition sources. Chlorinated cleaner tends to be chosen where non-flammability is a priority. It also calls for better ventilation and strict separation from any heat or welding work.
Check local restrictions before you shop
Some states regulate the chemistry or volatile organic compound (VOC) content of aerosol brake cleaners. California is the best-known example. In those areas, a store may carry only compliant formulas, so the product range can differ from one state to the next. If a product you see online isn't on the shelf locally, regulation may be the reason. The local store's listing will show what it is allowed to sell.
Single can or a case
One complete brake job usually takes at least one can, often more if you clean calipers, brackets and hardware thoroughly. A case can make sense if you do frequent brake work, maintain several vehicles or use brake cleaner as a general degreaser. Whether a case is cheaper per can depends on current pricing, which was not supplied here. Compare the per-can price of a case against single cans before you buy.
Confirm the formula type is the same for every can in the case. Check whether your local store stocks the case or must order it for pickup or delivery. Store aerosol cans away from heat sources, and follow any storage limits on the label. This matters more with flammable non-chlorinated cans.
Compatibility checks before spraying
Brake cleaner is meant for bare metal brake parts. It can damage painted surfaces, some plastics and rubber seals, so keep overspray off painted calipers or wheels unless the label says it is safe for them. Shield nearby rubber components. Read the label for the surfaces it is rated for, and follow its directions on ventilation and protective gear.
What this article could not confirm
No source data was supplied on current AutoZone prices, specific brands or can sizes stocked, case quantities, or store-level availability. Check those details with the store or its listings before you buy.