2004 Jeep Liberty Owner's Manual - Page 310

310 MAINTAINING YOUR VEHICLE Brake Master Cylinder The fluid level in the master cylinder should be checked when performing under hood services, or immediately if the "Brake Warning Light" shows system failure. Be sure to clean the top of the master cylinder area before removing the cap. If necessary, add fluid to bring the fluid level up to the requirements described on the brake fluid reservoir. With disc brakes, fluid level can be expected to fall as the brake pads wear. However, low fluid level may be caused by a leak and a checkup may be needed. Use only manufacturer's recommended brake fluid, refer to Recommended Fluids, Lubricants, and Genuine Parts for correct fluid type. WARNING! Use of a brake fluid that may have a lower initial boiling point or unidentified as to specification, may result in sudden brake failure during hard prolonged braking. You could have an accident.