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GM COACH MAINTENANCE MANUAL
Sec. 4
Page 77
BRAKE SPECIFICATIONS
BRAKE SPECIFICATIONS
AIR BRAKES
BRAKE DRUM
Diameter . • • . • . . • • . . . • . . . . . . . . • . . , .
Maximum Allowable Out-of-round . . • . . . . . .
Regrinding Limits (beyond original diameter)
BRAKE LINING
Length -
each piece (2 pieces per shoe).
'
Width
. • . • • • • • • . .
..............
Thickness • . . . • • • •
Area Per Wheel . • . •
BRAKE SHOE RETURN SPRING
Free Length
Length @ - lbs. pull
CAMSHAFT
Diameter at Bearing
. . . • . .
Diameter at Spider (rear only)
Spider Bushing
I.
D.
. • . . • .
CAM ROLLER IN SHOE
Standard Roller Diameter
Oversize Roller Diameter . . . . •
Roller Side Clearance (Approx.)
Roller Pin Diameter
. . . • . .
Diameter of Hole in Roller
ANCHOR PINS AND BUSHINGS
Pin Diameter at Bushings •
Pin Length
. • . . . . • . • • .
Bushing Diameter
Inside . . • . . . . .
Outside . . . • . • .
Bushing Length . . .
Diameter of Hole in Shoe
BRAKE CHAMBERS
Diameter . . • • . • . . . . . . . . •
. • . • • .
Type (Stamped on Unit). • . . .
. . . . . •
Spring Force at
3/
4
11
Stroke
Minimum Stroke when Brakes are Adjusted
Adjust When Stroke Reaches (Max.) . . . . .
SLACK ADJUSTERS
Type . . . . . . . . . . . . . . . . . .
Lever Bushing I.D.
. . . • . • .
Length Between Hole Centers
FRONT
14.490" - 14.510
11
0.010
11
0.125"
7.33"
4"
3/4"
117 sq. in.
8-3/8"
9"
@
50-60 lbs.
1.495" - 1.493
11
1.248
11
-
1.252
11
1.748" - 1.752
11
0.033
11
0.748
11
-
0.749"
0.754" - 0.756
11
1. 248" - I. 25 0
11
4-3/8"
1.254
11
-
1.256"
Tight in Shoe
1-15/16
11
1.373
11
, -
1.375"
8-1/16"
C
29-1/2
±
3 lbs.
Short as possible
1-3/4"
15-2
0.501
11
-0.503"
6"
REAR
14.490" - 14.510"
0.010
11
0.125
11
7.33"
4"
3/4"
234.5 sq. in.
9-1/8"
9-3/4"
@
85-95 lbs.
1.495" - 1.493
11
1.368" - 1.370"
1.374
11
-
1.376"
1.248
11
-
1.252
11
1.748
11
-
1.752
11
0. 033
11
0.748
11
-
0.749"
0.754" - 0.756"
1.2475
11
-
1.249"
7-9/32"
1.254" - 1.256"
Tight in Shoe
1-15/16"
1.373
11
-
1.375
11
9-7/8"
G
+
55-6lbs.
without brakes dragging
1-3/4''
15-2
0.501
11
-0.503
11
6"
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