RADIATOR HEAD 0832136 - Caterpillar

The brake will drag if the auxiliary system pressure drops below 8613 kPa (1250 psi). Do not engage the parking brake while the machine is moving unless an emergency exists. The use of the parking brake as a service brake in regular operation will cause rapid wear to the brake pads.
Personal injury or death can result from sudden machine movement.Sudden movement of the machine can cause injury to persons on or near the machine.To prevent injury or death, make sure that the area around the machine is clear of personnel and obstructions before operating the machine.
Illustration 1 g00871910
The parking brake is a spring applied, hydraulically released system. A hydraulic force is used in order to overcome the force of the spring tension. The hydraulic force releases the parking brake.