SECTION 12: BRAKE AND AIR SYSTEM
12.1.1
13.
MISCELLANEOUS VALVES .......................................................................................................................... 17
13.1
13.2
13.3
13.4
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
13.9
SPRING BRAKE VALVE (SR-7) ........................................................................................................................ 22
14.
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
18.2.6
Range of Movement ............................................................................................................................................ 34
18.2.7
18.2.8
18.2.9
18.2.10
18.2.11
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