Chevrolet 1977 10 Series, Repair Manual, Page: 178 / 468

5-12
OVERHAUL MANUAL
Fig. 5-1 OB—In s ta llin g A ir V a lve P lu n g e r
AIR V A L V E
D I I I M r ' C D
REAR PLATE
I
REAR DIAPH RAG M
R E T A I N E R H H
■ C E N T E R PLATE
FRONT DIAPHRAGi
Fig. 5-1 1 B—In s ta llin g Rear D ia p h ra g m R e ta in e r
Fig. 5 -1 2 B G a g in g P iston Rod
DELCO SINGLE DIAPHRAGM POWER BRAKE UNIT
UNIT REPAIR
Disassembly
1. Scribe a mark on bottom center of front and rear
housings to facilitate reassembly.
2. A ttach base of Tool J-22805 to front housing with nuts
and washers and draw down tight to eliminate bending or
damage to studs. Clamp base in bench vise with power section
up (fig. 5-2C).
3. Separate front and rear housings as follows:
a. Straight Mounting Bracket (Fig. 5-3C) - Place
Spanner W rench J-9504 over studs on rear housing and
attach with nuts and washers. D raw nuts down tight to
eliminate bending or damaging of studs.
b.
Tilt Mounting Bracket (Chevelle)
- Secure
Spanner W rench J-9504 to bracket with three bolts and nuts.
Draw nuts down tight to eliminate damage to bracket.
c.
Tilt Mounting Bracket Except Chevelle (Fig.
5-4C)
- Place Tool J-22893 inside tilted mounting bracket.
Place Spanner W rench J-9504 on top of J-22893 and tighten
nuts and washers securing spanner wrench.