Brake Master Cylinder
The fluid level in the master cylinders should be checked whenever the vehicle is serviced. If necessary, add fluid to bring level to the full level mark on the side of the reservoir of the brake master cylinder. With disc brakes, fluid level can be expected to fall as the brake pads wear.
If the brake fluid level is abnormally low, check system for leaks.
Refer to “Fluids, Lubricants, and Genuine Parts” in “Maintaining Your Vehicle” for further information.
• To avoid contamination from foreign matter or moisture, use only new brake fluid or fluid that has been in a tightly closed container. Keep the master cylinder reservoir cap secured at all times.
Brake fluid in a open container absorbs moisture from the air resulting in a lower boiling point.
This may cause it to boil unexpectedly during hard or prolonged braking, resulting in sudden brake failure. This could result in a collision.
• Overfilling the brake fluid reservoir can result in spilling brake fluid on hot engine parts, causing the brake fluid to catch fire. Brake fluid can also damage painted and vinyl surfaces, care should be taken to avoid its contact with these surfaces.
• Do not allow petroleum based fluid to contaminate the brake fluid. Brake seal components could be damaged, causing partial or complete brake failure. This could result in a collision.
Test yourself
A quick Jeep Wrangler quiz: every answer comes with an explanation and a link to the manual page.