Only the Sidekick Sport is equipped with a hydraulic clutch actuation system and, therefore, is the only vehicle with a clutch master cylinder.
When adding fluid to the hydraulic clutch system ONLY use fresh DOT 3 brake fluid from a sealed container. DOT 3 brake fluid will absorb moisture when it is exposed to the atmosphere, which will lower its boiling point. A container that has been opened once, closed and placed on a shelf will allow enough moisture to enter, over time, to contaminate the fluid within.
See Figure 1
Brake fluid level and condition is a safety related item and it should be checked ANY TIME the hood is opened. Your vehicle should not use clutch (brake) fluid rapidly (unless there is a leak in the system).
The clutch master cylinder reservoir is located under the hood, on the left side firewall near the brake master cylinder. The Sidekick Sport is equipped with a see-through plastic reservoir. This makes checking the level easy and helps reduce the risk of fluid contamination (since you don't have to expose the fluid by opening the cap to check the level). Fluid may be kept between the MIN and MAX lines, but the level should ideally be maintained at the MAX mark. If the fluid level is near or below the MIN mark, fill the reservoir to the MAX mark.
If it becomes necessary to add fluid to the system, take a moment to clean the area around the cap and reservoir. Use a clean rag to wipe away dust and dirt which could enter the reservoir after the cover is removed. If the level of the fluid is less than half the volume of the reservoir (and the clutch disc is not approaching a replacement point), it is advised that you check the system for leaks.