Chevrolet 10 Series 1970 Service Manual page 287

7. In stall anchor plunger components as d escribed un­
d er " B r a k e Actuation Components."
8. In stall brake shoes and brake cham ber as detailed
under applicable procedu res.
Initial Adjustment
If a new in stallation has just been made as d escribed
above, start engine and build up requ ired amount of a ir
p ressu re in system . Then pump the brake pedal until the
automatic adjuster system
su fficien t brake fo r safe drivin g.
made with the veh icle in motion, by pumping the pedal.
SERVICING STANDARD STOPMASTER
BRAKE CHAMBERS
It is recom m ended that a ll brake cham bers be r e ­
m oved, disassem bled, inspected and thoroughly cleaned
at the tim e that brakes are re lin e d or at one yea r period s,
w h ich ever occurs fir s t (also dependent upon type of op-
F ig . 88—T ig h te n in g C ham ber C o lle t N u t
Diaphragm
Rubber Boot Plate Rod
F ig . 8 7 —Stopm aster A ir Cham ber Component's
adjusts enough to provide
Final adjustment is
Pressure
Rubber
Housing
Diaphragm
eration and operator ex p erien ce).
p ro p er lubrication and replacem ent of any worn parts on
a p reven tive maintenance basis w ill assure p ro p er o p er­
ation of the system at a ll tim es.
Instructions c overin g the rem oval and s e r v ic e of stan­
dard chambers follow s (F ig . 87).
Removal and Disassembly
1. Disconnect a ir lines fro m chambers.
2. Using a punch, d riv e lock washer protrusions fro m
notches in spanner nut and spider housing.
3. Using a spanner wrench or a punch and ham m er,
loosen spanner nut which secu res a ir cham ber to
brake spider housing.
4. Rem ove a ir cham ber assem bly fro m brake spider
housing.
5. R em ove bolt and nut which secure clam ping ring.
6. Scribe a m ark a cro ss the p ressu re housing and the
n on-pressu re housing to assure p ro p er reassem bly.
7. Rem ove diaphragm,
housings.
Cleaning and Inspection
1. Clean a ll m etal parts thoroughly, using a suitable
cleaning fluid. Blow dry with a ir o r wipe dry with
cloth. (Do not use solvent on diaphragm .)
2. Examine diaphragm and rep la ce with new part i f any
signs of w ear o r deteriora tion are evident.
3. Inspect p ressu re housing fo r scratches, sco res , or
ex ce s s iv e w ear. Exam ine a ll parts fo r obstructions
and rem ove any fo re ig n m atter.
4. Exam ine diaphragm plate rod boot fo r d eteriora tion
or cracks. If deterio ra tio n
evident, rep la ce. In
n ecessa ry to rem o ve the plastic guide fro m the end
of the rod. If the guide is damaged or worn, it too
should be replaced. Apply a lib e ra l amount o f rubber
cem ent to boot flange and mating su rface on non­
pressu re housing.
Brake Cham ber
Assembly and Installation
1. Install boot, rod, g u i d e ,
pressu re housing.
2. Position p ressu re housing on non-pressure housing
so that scrib e m arks
aligned.
BRAKES 5-49
Thorough cleaning,
rod, boot and g u i d e fro m
or other damage is
o rd er to rep la ce boot it is
and diaphragm in non­
made at disassem bly are
CHEVROLET TRUCK SERVICE MANUAL