Chevrolet 10 series 1973, Руководство по капитальному ремонту

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BRAKES 5 -1 9
never contact the shorter section (higher level) of
the gauge. Move gauge from side to side to check
piston rod height.
6. Any variation beyond these two limits indicates an
incorrect piston rod. Since the piston rod is non-
adjustable, a new correct piston rod must be
installed.
7. Wipe a thin film of Delco Silicone Lube #5459912
(or equivalent) on the I.D. of the front housing seal
and position seal in the depression in the housing.
8. Install the master cylinder assembly on the front
housing, positioning the cylinder on the mounting
studs so that the top of the master cylinder reservoir
is toward the scribe marks on the housings.
9. Install nuts on the studs and torque to 25 ft. lbs.
CAUTION:
See " Caution" on Page 1 o f this
section.
BENDIX POWER BRAKE CYLINDER
SINGLE DIAPHRAGM TYPE
INDEX
Disassembly.......................................................................................... 5-19
Cleaning................................................................................................. 5-21
Inspection.............................................................................................. 5-22
Assembly................................................................................................ 5-22
OVERHAUL OPERATIONS
Disassembly (Figs. 1C and 2C)
The following procedure applies to the power section of
the power brake unit only. For service of the master
cylinder, refer to applicable portion of "Standard
Brakes" in the "Service" manual.
1. Scribe across outer edge of both housings and, if
used, across mounting bracket flanges to provide a
guide mark for reassembly.
2. Remove master cylinder attaching nuts and set
master cylinder aside.
3. Remove the front housing seal (fig. 2C); pulling the
piston rod from the front housing will also remove
the seal assembly. Remove the piston rod.
4. Attach base of Holding Fixture 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. 2A).
CAUTION:
Be sure to align tool so that the
check valve in the front housing is not
damaged.
5. Loosen locknut and remove push rod clevis and
locknut, if so equipped.
6. Remove the mounting bracket from the rear
housing, if so equipped.
7. Remove the dust boot retainer, dust boot and
silencer from the diaphragm plate extension.
8. The edge of the rear housing contains twelve lances.
Four of these lances (one in each quadrant) are deeper
than the other lances (fig. 3C). The metal that forms
the four deep lances must be partially straightened so
that the lances will clear the cutouts in the front
housing. If the metal tabs that form the deep lances
crack or break during straightening, the housing must
be replaced.
9. Place Spanner Wrench J-9504 over studs on rear
housing and attach with nuts and washers. Draw
nuts down tight to eliminate bending or damaging
of studs (fig. 3A).
W A R N IN G :
When separating housings, maintain
pressure on rear housing as it is under spring tension.
10. Press down on Spanner Wrench J-9504 and rotate
the rear housing clockwise to separate the two
housings. If the rear housing cannot be readily
loosened, tap the rear housing lightly with plastic
hammer.
11. Remove Tool J-9504 from the rear housing.
CAUTION:
Care must be exercised not to
damage or loosen studs in the rear housing.
Also, take care that no pressure is brought to
bear on plastic diaphragm plate tension.
12. Lift the rear housing assembly from the unit.
OVERHAUL MANUAL