MODULE-CONTROL 2069503 - Caterpillar

Note: Record the baseline value of the piston stroke. Compare the baseline value of the piston stroke to the measured stroke throughout the life of the brake. The brake is completely worn when the measured stroke is equal to the baseline value of the piston stroke plus the "100 percent" value. Refer to the value shown in Table 3.Note: The brake assembly should be rebuilt when the wear reaches 75 percent. Refer to the Testing and Adjusting, "Worksheets" located in the back of this book.
Remove gauge plug (3) . Install the plug.
Repeat Steps 1 through 12 for the other side.
Personal injury or death can result from air in the oil for the brake hydraulic system.Air in the system can prevent complete brake application and it is possible that the wheels on the machine can not be stopped.Air must not be in the oil for the brake hydraulic system to function properly.
Make sure that you remove all air from the hydraulic brake system. See the Testing and Adjusting, "Brake System Air - Purge" for the procedure.Brake Disc Wear Check And Plate Wear Check
Note: See Specifications, "Air System and Brakes" for new dimensions.Friction Discs
Check for the thickness of the discs. Determine if friction material needs to be removed. (This is material that has flaked off.) Check for shallow oil grooves.
Table 4
Table For Determining The Wear Of Friction Disc    
Percentage Of Disc Wear     Disc Thickness    
0 percent    
5.08 mm (.200 inch)    
10 percent    
5.03 mm (.198 inch)    
20 percent    
4.98 mm (.196 inch)    
30 percent    
4.93 mm (.194 inch)    
40 percent    
4.88 mm (.192 inch)    
50 percent    
4.83 mm (.190 inch)    
60 percent    
4.78 mm (.188 inch)    
70 percent    
4.72 mm (.186 inch)    
80 percent    
4.67 mm (.184 inch)    
90 percent    
4.63 mm (.182 inch)    
100 percent    
4.57 mm (.180 inch)    
Table 5
Table For Determining The Wear Of The Grooves In The Friction Disc (1)    
Percentage Of Disc Wear     Disc Groove Depth    
0 percent    
0.64 mm (0.025 inch)    
10 percent    
0.62 mm (0.024 inch)    
20 percent    
0.60 mm (0.024 inch)    
30 percent    
0.59 mm (0.023 inch)    
40 percent    
0.57 mm (0.022 inch)    
50 percent    
0.55 mm (0.022 inch)    
60 percent    
0.53 mm (0.021 inch)    
70 percent    
0.51 mm (0.020 inch)    
80 percent    
0.50 mm (0.020 inch)    
90 percent    
0.48 mm (0.019 inch)    
100 percent    
0.46 mm (0.018 inch)    
( 1 ) This measurement is based on three measurements per side and the measurements are taken at 25.4 mm (1.00 inch) from the outside of the disc. Replace the discs if any of the following conditions exist.
The remaining brake disc life does not last until the next rebuild of a major component.
The disc has more than 20 percent of a wear difference