Section IV. BRAKE SYSTEM MAINTENANCE

TM 9-2320-285-24-2

Section IV. BRAKE SYSTEM MAINTENANCE

This section contains the information you'll need to maintain the:

Treadle Valve

Hand Brake Controls

Brake Controls

Air Compressor

This section tells you how to troubleshoot problems, and repair or replace the components that are within

the scope of direct support maintenance.

Para

Troubleshooting Symptom Index....................................................

3-20

Treadle Valve and Brake Controls

Troubleshooting..............................................................................

3-21

Air Compressor Troubleshooting ...................................................

3-22

Treadle Valve Maintenance............................................................

3-23

Brake Controls Maintenance ..........................................................

3-24

Air Control Valve.............................................................................

3-24a

Quick Release Valves ....................................................................

3-24b

Trailer Hand Brake Control Valve...................................................

3-24c

Double Check Valve .......................................................................

3-24d

Automatic Drain Valve ....................................................................

3-24e

Ratio Reducing Valve .....................................................................

3-24f

Relay Valve . .................................................................................

3-24g

Tractor Protection Valves ...............................................................

3-24h

Air Compressor Assembly Maintenance ........................................

3-25

Air Compressor Governor ..............................................................

3-25a

Air Compressor Assembly ..............................................................

3-25b

3-20. TROUBLESHOOTING SYMPTOM INDEX

Para/Malfunction

Page

TREADLE VALVE AND BRAKE CONTROLS

Rapid pressure drop after engine is shut down (brakes

released) ........................................................................................

3-21/1

3-154

Rapid pressure drop after engine is shut down (brakes

applied)...........................................................................................

3-21/2

3-154

Pressure builds up slowly ...............................................................

3-21/3

3-154

Pressure too high, or compressor won't cut out .............................

3-21/4

3-155

Parking (spring) brakes won't release ............................................

3-21/5

3-155

Parking (spring) brake won't apply .................................................

3-21/6

3-157

Front and rear service brakes release slowly.................................

3-21/7

3-158

Front service brakes release slowly ...............................................

3-21/8

3-158

Rear service brakes release slowly................................................

3-21/9

3-158

Trailer brakes do not release .........................................................

3-21/10

3-159

Trailer service brakes do not function (cab guard) .........................

3-21/11

3-159

Trailer service brakes do not function (rear of tractor) ...................

3-21/12

3-161

AIR COMPRESSOR

Pressure too high, or air compressor won't cut out ........................

3-22/1

3-161

Air compressor knocks ...................................................................

3-22/2

3-161

3-153