HARNESS AS-CONSOLE 2245059 - Caterpillar

Check For Leakage In The Master Cylinder
Rear Brakes
Illustration 2 g00540968
Rear Slack Adjuster (3) Fitting (4) Hose
In order to check for leakage of the master cylinder, disconnect hose (4) from the slack adjuster and install a 6V-9511 Face Seal Plug in fitting (3) .
Install the FT1097 Displacement Gauge. Start the engine and allow the air system pressure to rise above 550 kPa (80 psi).
Activate the service brakes or the retarder. Push down the rod of the displacement gauge until the rod contacts the plate in the master cylinder. Measure the extension of the rod.
After approximately 10 minutes, push down on the rod again. Measure the distance. A decrease in the extension length of more than 3.20 mm (0.125 inch) during the 10 minute check is an indication of leakage.
If no leakage is indicated, see "Brake Piston Seal Leakage Check".
If leakage is indicated, check all hose connections for leaks. Also, check the outside of the master cylinder for leaks. If no external leaks are found, check the master cylinder piston seals and the makeup valve for wear or for damage.Front Brakes
Oil is sent from the front brake master cylinder to a tee. Oil flows from the tee to the front brakes. In order to check for leakage of the master cylinder, disconnect the hose that supplies oil to the tee. This tee is located behind the right front wheel. Install a 6V-9509 Face Seal Plug in the fitting on the hose.
Install the FT1097 Displacement Gauge. Start the engine and allow the air system pressure to rise above 550 kPa (80 psi).
Activate the service brakes or the retarder. Push down the rod of the displacement gauge until the rod contacts the plate in the master cylinder. Measure the extension of the rod.
After approximately 10 minutes, push down on the rod again. Measure the distance. A decrease in the extension length of more than 3.20 mm (0.125 inch) during the 10 minute check is an indication of leakage.
If no leakage is indicated, check all hoses and connections from the tee to the brakes for leakage. Check the calipers for leakage.
If leakage is indicated, check all hose connections for leaks. Also, check the outside of the master cylinder for leaks. If no external leaks are found, check the master cylinder piston seals and the makeup valve for wear or for damage.Brake Piston Seal Leakage Check
Note: This check is only for the rear brakes.Remove the air pressure from the air system for the service brakes and for the retarder brake system before you remove the plug from the rear brake master cylinder.
Personal injury or death can result from sudden machine movement.Sudden movement of the machine or release of air pressure or oil pressure can cause injury to persons on or near the machine.To help prevent possible injury before testing and adjusting any air system or hydraulic system, perform the procedure in the Testing and Adjusting, "General Information" section.
Personal injury or death can result from machine movement.Place blocks in front of and behind the wheels to