GMC 4000 Series Service Manual page 232

G M C S E R V I C E M A N U A L
L im itin g— Q uick
Release V a lv e
Inlet
V a lv e
V a lv e
Carrier
Front
Brake
C h a m b e rs
D R Y R O A D P O S IT IO N
Lim itin g— Q u ick
Release V a lv e
Inlet
V a lv e
V a lv e
C arrier
Front
Brake
C ha m b ers
SLIPPERY R O A D P O S IT IO N
Figure 18— Front Brake Limiting a n d T w o -W a y Control V a lve O peration
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J
1^ *0
Sec. 5B
Page 225
AIR BRAKES
E xh au st
Port
P lu nger
V a lv e
Disc
TPM-6583