When adding fluid to the brake master cylinder, always use Delco® Supreme fluid part no. 1052535 or equivalent DOT-3 brake fluid from a clean, sealed container.
When adding fluid to the 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. If your brake fluid is contaminated with water, you could boil the brake fluid under hard braking conditions and lose all or some braking ability. Don't take the risk, buy fresh brake fluid whenever you must add to the system.
The brake fluid master cylinder is located under the hood, attached to the brake booster and firewall on the driver's side of the engine compartment.
Observe the fluid level indicators on the master cylinder; the fluid level should be between the MIN and MAX lines.
Before removing the master cylinder reservoir cap, make sure the vehicle is resting on level ground and clean all dirt away from the top of the master cylinder. Unscrew the cap and fill the master cylinder until the level is between the MIN and MAX lines.
If the level of the brake fluid is less than half the volume of the reservoir, it is advised that you check the brake system for leaks. Leaks in a hydraulic brake system most commonly occur at the wheel cylinder and brake line junction points.