Chevrolet 1988 Light Duty Truck Repair Manual page 315

The following notice applies to one or more steps in the assembly procedure of com ponents in this portion of the
manual as indicated at appropriate locations by the term inology NOTICE: See 'N otice' on page 5-1 of this section.
NOTICE: This fa ste n e r is an im p o rta n t a tta c h in g p a rt in th a t it c o u ld a ffe c t the p e rfo rm a n c e o f vita l c o m p o n e n ts and
system s, a n d /o r c o u ld re s u lt in m a jo r re p a ir expense, it m u s t be re p la c e d w ith one o f the same p a rt n u m b e r o r w ith
an e q u iv a le n t p a rt if re p la c e m e n t b e co m e s necessary. Do n o t use a re p la c e m e n t p a rt o f le sse r q u a lity o r s u b s titu te
d esign. Torque values m u s t be u se d as s p e c ifie d d u rin g re assem b ly to assure p ro p e r re te n tio n o f th is part.
SUBJECT
Hydraulic B o o s te r ............................................................................................................................................................................... 5 - 1
Bendix H ydro-B o o st.........................................................................................................................................................................5 - 1
Master C y lin d e rs ..................................................................................................................................................................................5 - 4
Composite Master C y lin d e r.......................................................................................................................................................... 5 - 4
Cast Iron Master C y lin d e r.............................................................................................................................................................5 - 4
Bendix Master C y lin d e r..................................................................................................................................................................5 - 6
Vacuum B oosters..................................................................................................................................................................................5 - 9
Single Diaphragm Vacuum B o o s te r...............................................................................................................................................5 - 9
Tandem Diaphragm Vacuum B o o s te r .......................................................................................................................................... 5-11
S pecifications.........................................................................................................................................................................................5 -1 4
Special T o o ls ................................................................................................................................................. L .....................................5 -1 5
BENDIX HYRDO-BOOST
E3
R em o ve or D isco n n ect (F ig u re 1)
Bendix Hydro Boost Model has identifying inform ation
stam ped into the housing near the inlet line.
C A U T IO N : T h e a c c u m u la to r
compressed gas. Always use proper tools and
follow recomm ended procedures or personal
in ju ry m ay re s u lt. Do n o t a p p ly h e a t to
a c c u m u la to r. Do not a tte m p t to re p air an
inoperative accumulator, always replace with a
new accumulator. Dispose of an inoperative
accum ulator by drilling a 1 /i6-inch diam eter hole
th ro u g h th e end of th e a c c u m u la to r can
opposite the " O " ring.
Tools Required:
J 26889 A ccum ulator Com pressor
• Place J 26889 over the end of the accum ulator and
install a nut onto the stud (figure
• Depress the accum ulator with a C-clamp.
• Insert a punch into the hole on the housing.
1. Retainer (1).
• Release the C-clamp.
• Remove J 26889.
2. A ccum ulator (2) and O-ring (3).
3. Retainer (4).
6
4. Plug (5), O-ring ( ) and spring (7) (figure 3).
SECTION 5
BRAKES
CONTENTS
HYDRAULIC BOOSTER
c o n ta in s
12
i g *
1 3
2
).
Retainer (26).
Output pushrod (28), baffle (27), piston return spring
(25) and retainer (24).
Saw off the eyelet of the pedal rod (20).
7. Boot (19).
8 Nut (18) and bracket (17).
.
9. Bolts (9).
• Separate the cover (16) from the housing (
10 Seals (14 and 15).
.
11
Piston assem bly (22) and seal (23).
.
Spool valve (13).
.
13. A ccum ulator valve (11) (figure 4).
• Make a wire hook to aid in the removal.
14. Return line fitting (12) and seal (10).
Clean
All the parts with power steering fluid.
In sp ect
Spool valve and spool valve bore for corrosion, nicks
and scoring. If found, replace the com plete booster.
Discoloration of the spool or bore is not harm ful and
is no cause for replacement.
Housing and cover sealing surface for corrosion, or
nicks.
Tube seat in the h o u s in g fo r b u rrs, nicks or
corrosion. Replace if needed (figures 5 and
5-1
PAGE
8 ).
6
).