Chevrolet 10 series 1973, Overhaul Manual

Page: 127 / 522

5 - 2 4 BRAKES
Fig. 4C--1nstalling Rear Housing Seal
7.
Clevis Type Push Rod
- Install locknut and push rod
clevis.
8. Install mounting bracket to the rear shell, if so
equipped.
CAUTION:
See " Caution" on Page 1 of this
section.
9. Remove power cylinder from vise and remove
Holding Fixture J-22805.
10. Apply Delco Silicone Lube #5459912 (or equiv­
alent) sparingly to the piston rod, keeping lubricant
away from rounded end of rod. Guide piston rod
into center bore of the diaphragm plate until it is
fully seated against reaction disc.
11. Install front housing seal. Press and seal into front
housing until seal is bottomed in recess of housing.
12. Install master cylinder to power cylinder. Install
attaching nuts and torque to 25 ft. lbs.
CAUTION:
See " Caution" on Page 1 of this
section.
NOTE: The piston rod is non-adjustable and
therefore no gauging procedures are
included.
BENDIX POWER BRAKE CYLINDER
DUAL DIAPHRAGM TYPE
INDEX
Disassembly....................................
Cleaning...........................................
Inspection........................................
Assembly..........................................
OVERHAUL
Disassembly (Figs. ID and 2D)
1. Scribe across the flanges of front and rear housings,
in line with master cylinder cover, to provide a
guide mark for reassembly.
2. Remove two (2) master cylinder attaching nuts and
remove the master cylinder.
3. Remove the front housing seal (fig. ID); pulling the
piston rod from the front housing will also remove
the seal. Separate the piston rod and seal.
4. If required, remove vacuum check valve from front
housing by pulling straight out on valve. Then
remove rubber grommet from front housing.
.....................................................5-24
.....................................................5-27
.....................................................5-27
.....................................................5-27
OPERATIONS
5.
Clevis Type Push Rod
- Loosen locknut and remove
clevis and locknut from push rod.
6. Unseat dust boot from flange of rear housing and
remove boot and silencer from assembly.
7. Using a thin-bladed screw driver carefully pry
silencer retainer off hub of rear diaphragm plate,
being careful not to chip plastic.
8. Squirt denatured alcohol down the push rod to
lubricate rubber grommet in the air valve.
9. Install end of air valve push rod in vise, leaving enough
clearance to position two (2) open end wrenches
between the vise and retainer on hub of rear plate.
OVERHAUL MANUAL