VALVE GP-CONTROL 3893108 - Caterpillar

Table 4
Brake Holding Ability Test (1)    
Engaged Brake     Engine Speed (rpm)     Engaged Brake     Engine Speed (rpm)    
Service Brake         Parking Brake        
Manual Retarder         Secondary Brake        
( 1 ) The engine speed should reach a minimum of 1200 rpm before there is any machine movement.
Table 5
Brake Master Cylinders    
Air/Hydraulic Cylinder     Air Pressure     Oil Pressure (1)    
Front Air/Hydraulic Cylinder            
Front Air/Hydraulic Cylinder            
Rear Air/Hydraulic Cylinder            
Rear Air/Hydraulic Cylinder            
( 1 ) The pressure of the oil in the front brakes should be 23 times the pressure of the air. The pressure of the oil in the rear brakes should be 6.6 times the pressure of the air.
Table 6
Slack Adjusters (1)    
Slack Adjuster     Pressure At The Slack Adjuster (2)     Pressure At The Wheel (3)    
Rear Slack Adjuster
Left Rear Wheel            
Rear Slack Adjuster
Right Rear Wheel            
( 1 ) The pressures should be approximately the same value.
( 2 ) Use the pressure tap on the slack adjuster.
( 3 ) Measure this pressure at the port that is labelled. "S"
Table 7
Leakage In The Parking And Secondary Brake    
Decrease In Pressure In The First Minute    
Plugged Wheel     Pressure Decrease     Plugged Wheel     Pressure Decrease    
No Plugged Wheels         -------     -------    
Left Rear         Left Front        
Right Rear         Right Front        
Table 8
Brake Wear    
Piston Travel     Front Brake     Front Brake
Percent of Wear     Rear Brake     Rear Brake
Percent of Wear    
New                    
Rebuild 1                    
Rebuild 2                    
Rebuild 3                    
Rebuild 4                    
Rebuild 5                    
Rebuild 6                    
Rebuild 7