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FIGURE 3 - 

M-21

, M-22

 MODULATOR NON-ANTILOCK APPLICATION OF SERVICE BRAKES

BRAKE VALVE

SPRING

SUPPLY

DIAPHRAGM

SUPPLY

SOLENOID

SPRING

EXHAUST

DIAPHRAGM

EXHAUST

SOLENOID

BRAKE

CHAMBER

EXHAUST PORT

FIGURE 4 - 

M-21

, M-22

 MODULATOR NON-ANTILOCK APPLICATION HELD POSITION

BRAKE VALVE

SPRING

SUPPLY

DIAPHRAGM

SUPPLY

SOLENOID

SPRING

EXHAUST

DIAPHRAGM

EXHAUST

SOLENOID

BRAKE

CHAMBER

EXHAUST PORT

Summary of Contents for M-21

Page 1: ...f individual wheel control applications the modulator is always the last control valve through which air passes on its way to the service brake actuator and a solenoid assembly which contains one norm...

Page 2: ...21 OR M 22 MODULATOR TO ANTILOCK CONTROLLER TO ANTILOCK CONTROLLER TO ANTILOCK CONTROLLER TO ANTILOCK CONTROLLER They are as follows Identification Air Line Connection 1 Supply incoming air from foot...

Page 3: ...SUPPLY DIAPHRAGM SUPPLY SOLENOID SPRING EXHAUST DIAPHRAGM EXHAUST SOLENOID BRAKE CHAMBER EXHAUST PORT FIGURE 4 M 21 M 22 MODULATOR NON ANTILOCK APPLICATION HELD POSITION BRAKE VALVE SPRING SUPPLY DIA...

Page 4: ...lifts the exhaust diaphragm from its seat Returning air flows past the open exhaust and out the modulator exhaust port Air will also flow past the open supply diaphragm and back to the application de...

Page 5: ...creased The modulator can enter the antilock hold or re apply mode from the antilock exhaust mode ANTILOCK HOLD The antilock controller will place the modulator in the hold position when it senses tha...

Page 6: ...ten or replace as necessary 4 Perform the ROUTINE OPERATION AND LEAKAGE TESTING described in this manual OPERATION LEAKAGE TESTS LEAKAGE TESTING 1 Park the vehicle on a level surface and block or choc...

Page 7: ...OURCE Read 3 5 to 5 OHMS B EXHAUST to SOURCE Read 3 5 to 5 OHMS C EXHAUST to HOLD Read 7 to 10 OHMS D Individually test the resistance of each pin to vehicle ground and note there is NO CONTINUITY If...

Page 8: ...ITION BRAKE VALVE SPRING SUPPLY DIAPHRAGM FIGURE 9 M 21 M 22 MODULATOR CONNECTOR VIEW M 21 MODULATOR M 22 MODULATOR CONNECTOR HOLD EXHAUST SOURCE EXHAUST HOLD SOURCE CONNECTOR SUPPLY SOLENOID SPRING E...

Page 9: ...rized air systems make certain to drain the air pressure from all reservoirs before beginning ANY work on the vehicle If the vehicle is equipped with an AD IS air dryer system or a dryer reservoir mod...

Page 10: ...10...

Page 11: ...11...

Page 12: ...12 BW1664 2004 Bendix Commercial Vehicle Systems LLC All rights reserved 6 2004 Printed in U S A...

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