Cadillac 60 Series 1963 Shop Manual page 167

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BRAKES
the vacuum stored in the unit is used, or in case
of vacuum failure at the unit, the brakes can be
applied in the conventional manner. However,
more effort is required due to the loss of power
assist.
The wheel cylinders are of the double piston
type and are made of sintered iron to resist
corrosion and sticking. A metal expander is used
in each piston cup to prevent brake fluid leakage
and reduce the possibility of air entering the
system during expansion and contraction of the
fluid.
The service brakes have self-adjusting brake
shoe mechanisms that assure correct lining-to-
drum clearances at all times. The automatic
adjusters operate only when the brakes are ap-
plied as the car is moving rearward or when the
car comes to an uphill stop.
The non-adjustable anchor on each brake as-
sembly is stationary and precision-located for
efficient braking.
The starwheel adjuster assemblies incorporate
spring steel thrust washers between the adjusting
screw and the adjuster end cap. These washers
provide a spring-cushioned contact between the
primary and secondary brake shoes, thus reducing
the possibility of vibration and squeak when the
brakes are applied. Brake shoe stabilizer plates
are used on the front wheel brake assemblies to
provide additional vibration control.
The brake linings are riveted to the shoes.
The primary linings are grooved at the center
to permit dissipation of heat from the surface
of the brake drum, resulting in better brake per-
formance and longer lining life.
Finned, cast iron brake drums with extended
flanges are used on both the front and rear wheels
to provide maximum brake cooling.
The parking brake assembly is mounted on the
cowl to the left of the steering column. The park-
ing brake will release automatically when the
transmission selector lever is moved into any
drive position with the engine running. It will
not release automatically, however, with the en-
gine running and the selector lever in neutral or
park, or in any position with the engine off. A
manual release, located on the upper end of the
parking brake assembly, may be used if the auto-
matic release is inoperative or if manual release
is desired at any time.
The parking brake automatic release mechanism
is operated by a vacuum diaphragm. When the
transmission selector lever is moved into any
drive position, with the engine running, a vacuum
valve in the neutral safety switch opens, evacu-
ating air from the diaphragm assembly, which
Fluid Reservoirs
Power Piston
Return Spring
Compensating Port
Floating
Piston
Spring
Diaphragm
Support Plate
Power Piston
Reaction Plate
Reaction Levers
Air Valve
Air Valve Spring
Retainer
s [ j e n c e r
Air Filter
\
Headnut
Spring Retainer I
Primary Sea
Protector Washer
Primary
Piston Spring
Primary Seal
Spring Retainer
Secondary
Push Rod
Dust Guard
Bearing Seal
Seal Band
Floating Control Valve
Power Piston Insert
Hydraulic Push Rod
Rear Shell
Seal y
Front Shell
Fig. 8-2 Delco Moraine Power Brake Unit