LINK AS 1328675 - Caterpillar

Personal injury can result if the machine moves while testing.If the machine begins to move during test, reduce the engine speed immediately and engage the parking brake.
The service brake holding ability test determines whether the service brake is functional. This test is not intended to measure the maximum brake holding ability.The holding ability of the service brakes at a specific engine rpm will be different for each machine.The results of the test should be recorded. The results should be compared to previous test results and subsequent test results. Use the comparison as an indication of system deterioration for a particular machine.
Before you perform the test, ensure that you can test the brakes on a surface which is level, dry, and clear of obstacles. Fasten your seat belt. Ensure that the transmission control is in the N position and that the parking brake control is in the ENGAGED position.Start the engine and wait until the brake system is fully charged.
Engage the service brakes. Move the transmission control to the 1 position. Move the parking brake control to the DISENGAGED position.
Gradually increase the engine speed until the machine moves forward. Record the engine speed when the machine moves.Reduce the engine speed immediately and move the parking brake control to the ENGAGED position. Move the transmission control to the N position. Shut off the engine.
If the machine moves at an engine speed below 1200 rpm, the service brakes require service.
If the machine moved while testing the service brakes, contact your Caterpillar dealer.Have the dealer inspect and, if necessary, repair the service brakes before returning the machine to operation.
Parking Brake Check
The test for the parking brake must be carried out with the rated load in the truck body or OEM attachment.Test the service brakes and the secondary steering system on level ground before you carry out this procedure.
Drive the machine onto an incline of 15%. The machine must be pointing down the incline.
Engage the service brakes in order to stop the machine on the incline. The area around the machine must be clear of personnel and obstacles.
Move the parking brake control to the ENGAGED position. Move the transmission control to the N position.
Shut off the engine.
Gradually disengage the service brakes.
If the machine moves forward, engage the service brakes immediately. Start the engine. Disengage the parking brake and drive the machine onto level ground. Shut off the engine.
Check the thickness of the brake pad linings and check the thickness of the brake disc. Refer to Specifications, RENR6724, "Parking Brake". Replace parts if the specification is not met.If the machine moved during the test, the parking brake requires service.
If the machine moved while testing the parking brake, inspect the parking brake components for wear or damage. Repair or replace the worn or damaged parking brake components as required before returning the machine to service.