RING-SEAL 3534937 - Caterpillar

Parking Brake Function
The parking brake function prevents the operator from operating the machine while the parking brake is engaged. Driving through the parking brake causes accelerated wear to the friction components of the parking brake.When the parking brake control is disengaged, the transmission will shift normally. When the parking brake control is engaged, the transmission will not shift out of neutral to first speed forward or first speed reverse. If the transmission is in first speed forward or in first speed reverse and the parking brake is moved to the engaged position, the transmission will shift into neutral. All of the modulating valves (transmission clutch) are de-energized. If the transmission is in second speed forward or in third speed forward, the transmission will remain engaged.The parking brake function activates a Warning Category 1 or a Warning Category 3 on the Caterpillar Monitoring System.Warning Category 1 is activated whenever the parking brake is engaged. The parking brake indicator will flash.While the parking brake is engaged, Warning Category 3 will be activated. This will occur if the operator places the transmission direction control switch in the FORWARD position or the REVERSE position. The parking brake indicator will flash and the action light will flash. The action alarm will sound.When the parking brake is engaged and the transmission is in first speed, the power train ECM shifts the transmission to neutral. The power train ECM also sends the parking brake status to the Caterpillar Monitoring System via the CAT Data Link. When the parking brake is engaged, the alert indicator for the parking brake flashes on the Caterpillar Monitoring System. If the operator selects the FORWARD position or the REVERSE position and the parking brake is engaged, the Caterpillar Monitoring System initiates a Warning Category 3. A Warning Category 3 causes the parking brake indicator and the action lamp to flash. The action alarm will also sound.Reference: For more information on the Caterpillar Monitoring System, refer to the Service Manual module Systems Operation, "Monitoring System (Power Train Functions)"