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SECTION 12: BRAKE AND AIR SYSTEM
12.1.1
Compressor Removal and Installation ................................................................................................. 16
13.
MISCELLANEOUS VALVES .......................................................................................................................... 17
13.1
EMERGENCY / PARKING BRAKE CONTROL VALVE (PP-1) ............................................................................. 20
13.2
OPTIONAL EMERGENCY / PARKING BRAKE OVERRULE CONTROL VALVE (RD-3) ......................................... 20
13.3
FLIP-FLOP CONTROL VALVE (TW-1).............................................................................................................. 20
13.4
DUAL BRAKE APPLICATION VALVE (E-8P)..................................................................................................... 21
13.4.1
Brake Pedal Adjustment....................................................................................................................... 21
13.4.2
Maintenance ........................................................................................................................................ 21
13.5
STOPLIGHT SWITCHES .................................................................................................................................. 21
13.6
PARKING BRAKE ALARM SWITCH ................................................................................................................. 21
13.7
BRAKE RELAY VALVE (R-14) .......................................................................................................................... 22
13.8
ANTILOCK TRACTION RELAY VALVE (ATR-6)................................................................................................. 22
13.9
SPRING BRAKE VALVE (SR-7) ........................................................................................................................ 22
13.10 PRESSURE PROTECTION VALVE (PR-4) ......................................................................................................... 23
13.11 SHUTTLE-TYPE DOUBLE CHECK VALVE (DC-4) .............................................................................................. 23
13.12 PRESSURE REDUCING VALVE RV-3 ............................................................................................................... 23
13.13 ANTILOCK MODULATOR (M-32QR) .............................................................................................................. 24
13.14 INVERSION VALVE (TR-2, TR-3) .................................................................................................................... 24
13.15 INLINE QUICK RELEASE VALVE (QR-L) .......................................................................................................... 24
14.
EMERGENCY DOOR OPENING VALVES ...................................................................................................... 24
14.1.1
Interior Valve Maintenance ................................................................................................................. 24
15.
AIR HORN VALVE ...................................................................................................................................... 25
16.
AIR SYSTEM TROUBLESHOOTING .............................................................................................................. 25
17.
BRAKE OPERATION ................................................................................................................................... 25
18.
DISC BRAKES ............................................................................................................................................. 26
18.1
INSPECTION POINTS ..................................................................................................................................... 26
18.2
FUNCTIONAL AND VISUAL CHECK ................................................................................................................ 30
18.2.1
Wear Check of Pads ............................................................................................................................. 30
18.2.2
Wear Check of Disc .............................................................................................................................. 32
18.2.3
18.2.4
18.2.5
Continuous Wear Sensor option .......................................................................................................... 34
18.2.6
Range of Movement ............................................................................................................................................ 34
18.2.7
Caliper check - Caliper Running Clearance ........................................................................................... 37
18.2.8
Caliper check - Caliper Movement Along Guide Pins ........................................................................... 37
18.2.9
Clearance Measurement Check of Bearing Variants (6) ...................................................................... 38
18.2.10
Checking Sealing Elements - Caliper Guide Pin Seals ...................................................................... 38
18.2.11
Checking Sealing Elements - Tappets and Boot Assemblies ............................................................ 39
18.3
PAD REPLACEMENT ..................................................................................................................................... 39
19.
SAFE SERVICE PROCEDURES ...................................................................................................................... 40
20.
AIR BRAKE TROUBLESHOOTING ................................................................................................................ 40
21.
BRAKE AIR CHAMBER ............................................................................................................................... 42
21.1
MAINTENANCE............................................................................................................................................. 42
2
PA1621 Maintenance Manual All Series | Revised June 2020

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