To replace the phrase "some brake things" with more specific language, you might consider the following options:
- "Some components of the braking system"
- "Some parts of the brake assembly"
- "Some brake pads and rotors"
- "Some worn-out brake parts"
- "The wheel cylinders and master cylinder"
Of these options, "some worn-out brake parts" or "some components of the braking system" would be the most accurate while still being general enough if the mechanic didn't specify. However, if you want to be precise and you know the specific parts that need replacement, "the wheel cylinders" would be the best choice.