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Section 12: BRAKE AND AIR SYSTEM

PA1562

15. STOPLIGHT SWITCHES.................................................................................................................13

16. PARKING BRAKE ALARM SWITCH .............................................................................................13

17. BRAKE RELAY VALVE (R-12 & R-14) ..........................................................................................13

18. QUICK RELEASE VALVES (QR-1)................................................................................................14

19. SPRING BRAKE VALVE (SR-7).....................................................................................................14

20. PRESSURE PROTECTION VALVE (PR-4)....................................................................................14

21. LOW PRESSURE INDICATOR (LP-3)............................................................................................15

22. SHUTTLE-TYPE DOUBLE CHECK VALVE (DC-4).......................................................................15

23. EMERGENCY DOOR OPENING VALVES.....................................................................................15

24. AIR HORN VALVE ..........................................................................................................................15

25. AIR SYSTEM TROUBLESHOOTING .............................................................................................15

26. BRAKE OPERATION......................................................................................................................16

27. AIR BRAKES...................................................................................................................................16

27.1 DISC BRAKES..............................................................................................................................16

27.1.1 Disc Brake Pads....................................................................................................................16

27.1.2 Caliper Maintenance .............................................................................................................16

27.1.3 Roadside Inspection for Knorr/Bendix Air Disc Brakes.........................................................18

27.1.4 Pad Removal.........................................................................................................................18

27.1.5 Checking Pad Wear ..............................................................................................................18

27.1.6 Important Pad and Rotor Measurements..............................................................................19

27.1.7 Checking Caliper Guidance and Seal Condition...................................................................19

27.1.8 Checking the Tappet Boots...................................................................................................20

27.1.9 Pad Installation......................................................................................................................20

27.1.10 Adjusting the Running Clearance......................................................................................20

27.1.11 Brake Tools........................................................................................................................21

27.1.12 Checking Brake Pads........................................................................................................21

27.1.13 Torque specifications.........................................................................................................21

28. SAFE SERVICE PROCEDURES ....................................................................................................21

29. AIR BRAKE TROUBLESHOOTING ...............................................................................................22

30. BRAKE AIR CHAMBER..................................................................................................................24

30.1 MAINTENANCE.............................................................................................................................24

30.2 EMERGENCY/PARKING BRAKE MANUAL RELEASE .........................................................................25

30.3 BRAKE CHAMBER REMOVAL.........................................................................................................25

30.4 BRAKE CHAMBER INSTALLATION...................................................................................................25

30.5 BRAKE CHAMBER DISASSEMBLY ..................................................................................................25

31. ANTI-LOCK BRAKING SYSTEM (ABS).........................................................................................26

31.1 TROUBLESHOOTING AND TESTING................................................................................................27

31.2 AUTOMATIC TRACTION CONTROL (ATC) – ELECTRONIC STABILITY PROGRAM (ESP)........................27

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