Chevrolet 10 Series 1970 Service Manual page 303

2. In stall grom m et on cap nut and screw cap nut into
body and tighten secu rely.
Installation
P osition valve in place with a rro w on side of body in ­
dicating d irection o f a ir flow . Secure a ir lin es to each
end of the valve.
Testing Rebuilt Unit
Both operation and leakage tests must be made as out­
lined under Maintenance and Adjustm ents— Single Check
V a lve.
LOW PRESSURE INDICATOR SWITCH (Fig. I l l )
The low p ressu re switch connects to a bu zzer that
sounds w henever a ir p ressu re drops below 60 psi.
Removal
1. Make certain ignition is o ff.
2. Exhaust a ll a ir fro m brake system .
3. Disconnect the e le c tr ic a l
p ressu re in dicator switch.
4. Disconnect the a ir line to the low p ressu re indicator
switch.
Installation
1. Mount indicator in place.
2. Attach and tighten mounting nut and connect a ir line.
3. Attach and tighten e le c tr ic a l connection.
1. Cam (In te g ra l w ith
S haft)
2. S pacing Washers
3. Seal
connections at the low
F ig . 107—A ir
4. Bushing
5. Flange P late
6. Cam shaft B racket
7. Seal R etainer
Replacement (Fig. I l l )
NOTE: If this switch is found d efective in te s t­
ing, o r leakage is evident, no re p a irs are r e c -
commended j u s t replacem ent
assem bly.
1. B lock and hold veh icle by means other than a ir
brakes.
2. Drain the a ir fro m the system .
3. Disconnect the e le c tr ic a l
p ressu re switch.
4. Disconnect the a ir line at the low pressu re switch.
5. U nscrew the switch
6. R ein stall new switch into the o rig in a l location and
tighten secu rely.
7. Connect a ir line and e le c tr ic a l connections to the
switch.
8. Build up the a ir in the system and check switch fo r
leaks.
9. Check operation o f switch.
AIR GAUGE
An a ir pressu re gauge, located on the instrum ent panel,
shows a ir pressu re in the system . It works in conjunction
with the low p ressu re switch to warn the op erator o f low
a ir pressu re.
Brake Cam shaft Assem bly
8. Cam shaft
9. C am shaft and Brake
Cham ber B racke t
10. Spacer
BRAKES 5-65
o f the switch
connections at the low
fro m its mounting position.
11. S la ck A d ju s te r
12. Lock Ring
13. S la ck A d ju s tin g
N u t
CHEVROLET TRUCK SERVICE MANUAL