
Standard Chamber Long Stroke Chamber
Rated Stroke Max Readjust Stroke Rated Stroke Max Readjust Stroke
12 1.75 1.38 2.00 1.50
16 2.25 1.75 2.50 2.00
20 2.25 1.75 2.50 2.00
24 2.25 1.75 2.50 2.00
30 2.50 2.00 2.75 2.25
36 3.00 2.25 - -
A schedule should be eA schedule should be e
A schedule should be eA schedule should be e
A schedule should be e
stst
stst
st
ablished for periodicablished for periodic
ablished for periodicablished for periodic
ablished for periodic
adjustment, inspection and lubricaadjustment, inspection and lubrica
adjustment, inspection and lubricaadjustment, inspection and lubrica
adjustment, inspection and lubrica
tion. This sched-tion. This sched-
tion. This sched-tion. This sched-
tion. This sched-
ule is deule is de
ule is deule is de
ule is de
tt
tt
t
ermined frermined fr
ermined frermined fr
ermined fr
om vom v
om vom v
om v
ehicle oehicle o
ehicle oehicle o
ehicle o
wner/operwner/oper
wner/operwner/oper
wner/oper
aa
aa
a
tt
tt
t
oror
oror
or
ss
ss
s
ee
ee
e
xperience and the txperience and the t
xperience and the txperience and the t
xperience and the t
ype of operype of oper
ype of operype of oper
ype of oper
aa
aa
a
tiontion
tiontion
tion.
BRAKE DRUMS
Inspect for heat checks, grooves, hot spots, glazing,
cracks, and out of round. Drums which are glazed,
grooved, or have moderate heat checking may be
resurfaced and returned to service. The drum should
not be used if it exceeds the manufacturer’s recom-
mended maximum diameter stamped on the drum.
BRAKE ADJUSTMENT
Brakes should be adjusted whenever the air chamber
push rod stroke exceeds the maximum distance accord-
ing to the chart shown in
FF
FF
F
igurigur
igurigur
igur
e 2e 2
e 2e 2
e 2. To determine if
brake adjustment is required measure the push rod
stroke with the brakes applied as shown in
FF
FF
F
igurigur
igurigur
igur
e 3e 3
e 3e 3
e 3
onon
onon
on
page 1page 1
page 1page 1
page 1
0.0.
0.0.
0.
PREVENTATIVE MAINTENANCE
CA CA
CA CA
CA
UTION:UTION:
UTION:UTION:
UTION:
Drums displaDrums displa
Drums displaDrums displa
Drums displa
ying heaying hea
ying heaying hea
ying hea
t checks witht checks with
t checks witht checks with
t checks with
a contina contin
a contina contin
a contin
uous length of four incheuous length of four inche
uous length of four incheuous length of four inche
uous length of four inche
s or mors or mor
s or mors or mor
s or mor
e ande and
e ande and
e and
ee
ee
e
xtxt
xtxt
xt
ends arends ar
ends arends ar
ends ar
ound the edge of the drum should beound the edge of the drum should be
ound the edge of the drum should beound the edge of the drum should be
ound the edge of the drum should be
rr
rr
r
eplaced. eplaced.
eplaced. eplaced.
eplaced.
See FSee F
See FSee F
See F
igurigur
igurigur
igur
e 1.e 1.
e 1.e 1.
e 1.
FF
FF
F
igurigur
igurigur
igur
e 1e 1
e 1e 1
e 1
FF
FF
F
igurigur
igurigur
igur
e 2e 2
e 2e 2
e 2
Chamber Size
Type
RECOMMENED AIR BRAKE ACTUATOR SERVICE STROKE
Source: The Maintenance Council RP 635
9
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