The brake warning light Jeep Grand Cherokee is designed to monitor various brake functions, such as the level of brake fluid and the application of the parking brake. If this light turns on, it may indicate a problem with one of these systems.
If the BRAKE light 
turns on and you suspect that the parking brake is applied, be sure to check that it has been properly released. If the brake fluid level is low, it should be filled to the appropriate level.
If the light remains on even when the parking brake has been disengaged and the fluid level is at the full mark on the reservoir, it could indicate a problem with the brake hydraulic system or with the brake booster. This means that there is a malfunction in the system that needs to be checked by a professional. The light will remain on until the condition is corrected.
If the problem is related to the brake booster, the ABS pump will run when applying the brake, and a brake pedal pulsation may be felt during each stop. Some vehicles are equipped with a dual brake system, which provides a reserve braking capacity in case of failure in any part of the hydraulic system. A leak in either half of the dual brake system is indicated by the brake warning light, which will turn on when the brake fluid level in the master cylinder has dropped below a specified level. The light will remain on until the cause is corrected.
It is important to have the vehicle checked by a professional as soon as possible if the brake warning light comes on in order to avoid any potential hazards.
ABS and EBD
The Anti-Lock Brake System (ABS) is a safety feature that is designed to help the driver maintain control of the vehicle during hard braking. Vehicles equipped with ABS are also equipped with Electronic Brake Force Distribution (EBD). This system helps to distribute the braking force to the appropriate wheels during braking.
In the event of an EBD failure, the brake warning light will turn on along with the ABS light. This indicates an immediate repair is required to the ABS system. If this happens, it is important to have your vehicle checked by an authorized dealer as soon as possible to avoid any potential hazards.
You can check the operation of the brake warning light by turning the ignition switch from the OFF position to the ON/RUN position. The light should illuminate for about two seconds. If the light does not turn off after that, it may indicate that the parking brake is applied or a brake fault is detected. If the light does not illuminate at all, it is recommended that you have the light inspected by an authorized dealer.
Additionally, the brake warning light will turn on when the parking brake is applied with the ignition switch in the ON/RUN position. This is a reminder to release the parking brake before driving.
