Chevrolet 1977 light duty truck, Service Manual

Page: 847 / 861

Fig. 9-8C-Release Switches, Valve and Brackets
B R A K E P E D A L P O S I T I O N
W H E N V A C U U M V A L V E
O P E N S
B R A K E P E D A L I N
N O R M A L P O S I T I O N
3 8 T O . 6 4
I N S T A L L A T I O N O F S E L F - A D J U S T I N G
V A C U U M R E L E A S E V A L V E
1. In s ta ll m o u n tin g c lip in to b ra c k e t.
2. D e p ress b ra k e pedal & pu sh v a lv e in to clip
u n til s h o u ld e r o n v a lv e asm b o tto m s o u t
a g a in s t c lip .
3. A d ju s t v a lv e b y b rin g in g p ed al to n o rm a l
p o s itio n so t h a t v a lv e is o p e n w h e n pedal
is de p ressed to d im e n s io n sh o w n .