* Line wrench: This is arguably the *most* important specialized wrench. A wheel cylinder line wrench is designed to grip and turn the brake line nuts without damaging the lines. These nuts are notoriously difficult to turn without this tool. They come in various sizes, so you'll need to know the size of your brake lines before purchase.
* Wheel cylinder spanner wrench: This wrench is specifically designed to compress the wheel cylinder pistons to allow for easier removal of the wheel cylinder itself. It usually has a pair of cups that fit into the wheel cylinder's piston bores. It might be more accurately called a "brake cylinder compressor" but the function is the same.
* Open-end or combination wrenches: You'll need a set of these in various sizes for the caliper mounting bolts (if the caliper needs to be removed or moved aside) and possibly other related hardware. Metric is crucial for a 1999 Chevy Malibu.
* Sockets and ratchet: Again, metric, and a variety of sizes to handle any bolt you encounter. A ratchet is much more efficient for many bolts than a wrench.
Important Note: While not strictly a *wrench*, you'll also absolutely need a brake bleeder wrench or a small open-end wrench that fits the bleeder valve on the wheel cylinder. This allows you to bleed the air out of the brake line after the cylinder is replaced.
Remember to always consult a repair manual specific to your 1999 Chevy Malibu. The exact sizes of wrenches and the specific procedure will vary slightly depending on the exact model and options. If you aren't comfortable with this kind of repair, taking it to a mechanic is always an option. Brake systems are crucial for safety.
