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BRAKES
5-39
2. Install brake shoes, drum and wheel; then flush and
adjusting screw; expand brake shoes at each wheel until the
bleed hydraulic system.
wheel can just be turned by hand. The drag should be equal
Adjustment at Rear Wheels
at all wheels.
2. Back off brake adiusting screw at each wheel 30
1. Using a punch, knock out lanced area in brake backing
notches. If shoes still drag l&htlyan drum, back off adjusting
plate. If this is done with the drum installed on the car, the
screw one or two additional notches. Brakes should be free
drum must be moved and all metal cleaned out of the brake
of drag when screw has been backed off approximately 12
compartment. Be sure to procure a new hole cover and install
notches. Heavy drag at this point indicates tight parking
it in the backing plate after adjustment to prevent dirt and
brake cables.
water from getting into the brakes. Use J 6166 to turn brake
3. Install adjusting hole cover in brake backing plate.
4. Check parking brake adjustment.
UNIT REPAIR
POWER BRAKE UNITS
CONTENTS
Removal and Installation of Power Brake Units
........
5-39
Disassembly of Delco Moraine
Tandem Power Brake Unit
........................................
5-39
Cleaning and Inspection Delco Moraine
Tandem Power Brake Unit
........................................
5-42
Reassembly of Delco Moraine Tandem
Power Brake Unit
......................................................
5 4 3
Gaging of Delco Moraine Tandem
Power Brake Unit
......................................................
5-45
Disassembly of Bendix Tandem
Power Brake Unit
......................................................
5-46
REMOVAL AND INSTALLATION OF
POWER BRAKE UNITS
1. Remove two nuts holding master cylinder to power
cylinder and position it away from power cylinder.
On the H car also remove the brake pipe distribution and
switch mounting bolt before moving master cylinder away
from power cylinder.
C AUTI 0 N: Do not disconnect hydraulic brake
lines; be careful not to bend or kink lines.
2. Disconnect the vacuum hose from the vacuum check
valve on the front housing of the power head. Plug vacuum
hose to prevent dust and dirt from entering hose.
3. Disconnect the power brake push rod from the brake
pedal.
4. Remove the four nuts from the mounting studs which
hold the power brake to the cowl.
5. Carry the power brake to a clean work area and clean
the exterior of the power brake prior to disassembly.
C A U T I 0 N
:
Fasteners in the following steps are
important attaching parts in that they could affect
the performance of vital components and systems
and/or could result in major repair expense. It
must be replaced with one of the same part
number, or with an equivalent part, i f replacement
becomes necessary. Do not use a replacement part
of lesser quality or substitgte design. Torque valves
Cleaning and Inspecting Bendix Tandem
Power Brake Unit
......................................................
5-46
Reassembly of Bendix Tandem
Power Brake Unit
......................................................
5-48
Gaging of Bendix Tandem Power Brake Unit
............
5-48
Disassembly of Delco Moraine
Power Brake Unit
.....................................................
5-49
Cleaning and Inspection Delco Moraine
Power Brake Unit
......................................................
5-51
Reassembly of Delco Moraine
Power Brake Unit
.....................................................
5-56
Gaging of Delco Moraine Power Brake Unit
..............
5-57
must be used as specified dunng reassembly to
assure proper retention of this part.
6. Mount power brake assembly to cowl and torque nuts
to specified torque.
7. Connect power brake push rod to brake pedal.
8. Connect vacuum hose to vacuum check valve.
9. Connect master cylinder to power cylinder and torque
nuts to 24 lb. ft. On the H car install the distribution and
switch mounting bolt.
DISASSEMBLY OF DELCO MORAINE
TANDEM POWER BRAKE UNIT
Disassembly of overall Unit
Scribe a line across front and rear housings to facilitate
reassembly.
1. Mount Unlock Tool J 23456 in a vise. Position
housing assembly on tool so that four studs fit in holes
provided. See Fig. 5-60.
2. Position handle over two studs with tubular
projections downward. Rotate screw to apply downward
pressure
to
handle,
then
rotate
front
housing
counterclockwise to unlock housings. It is normal for this
operation to require heavy pressure to unlock housings.
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