Do you need a caliper reset tool to replace the disks on Impala 2004 3.4?

You don't *need* a caliper reset tool specifically designed for a 2004 Impala 3.4L to replace the brake rotors (disks), but you will need a way to compress the caliper pistons. Many times, this can be done with a C-clamp and some strategically placed blocks of wood to protect the caliper and piston.

However, a caliper piston compression tool is often easier and safer to use. These tools help to avoid damaging the caliper piston or the brake line. While not strictly *required*, it's highly recommended for ease of use and to reduce the risk of injury or damage. Using the wrong technique can result in damaging the caliper piston seal.

In short: No, not strictly required, but highly recommended for a smoother, safer process.