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PART 2 -1
-
GENERALJBRAKE SERVICE
2 -3
COMMON ADJUSTMENTS AND REPADRS
'FRONT
CABLE
FIG. 1
-Parking Brake Linkage
PARKING BRAKE
and no drag is felt when turning
LINKAGE ADJUSTMENT
the rear wheels.
Check the parking brake cables
MASTER CYLINDER PUSH
when the brakes are fully released.
ROD ADJUSTMENT-
If the cables are loose, adjust them
POWER BRAKES
as follows.
1. Fully release the parking brake
by turning the handle counterclock-
wise and pushing it inward.
2. Pull the parking brake handle
outward one notch from its normal
released position.
3. Raise the car.
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'%.?~uni'.the adjustment nut for-
ward against the equalizer until a
moderate drag is felt when turning
the rear wheels.
6. When the cables are properly
adjusted, tighten the lock nut in the
direction of forward rotation against
the equalizer.
7. Release the parking brake, and
make sure that the brake shoes re-
turn to the fully released position
The push rod is provided with an
adjustment screw to maintain the
correct relationship
between
the
booster control valve plunger and the
master cylinder piston. Failure to
maintain this relationship will prevent
the master cylinder piston from
completely releasing ,hydraulic pres-
sure and can cause the brakes to
drag, or cause excessive brake pedal
travel.
To check the adjustment of the
screw, fabricate a gauge of the di-
mensions shown in Fig. 2. Then
place the gauge against the. master
cylinder mounting surface of the
booster body as shown in Fig. 3. The
push rod screw should be adjusted
so that the end of the screw just
touches the inner edge of the slot
in the gauge. Do not set up side
forces on the push rod. Side forces
may break the valve plunger.
This
is an approximate adjust-
ment only. The master cylinder pis-
ton should not move more than
0.015
inch as it contacts the push rod. No
movement (exact contact) is ideal.
,
HYDRAULIC SYSTEM BLEEDING.
When any part of the hydraulic
FIG.
2-Push
Rod
Gauge Dimensions
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