Chevrolet 1973 Overhaul Manual page 130

28. Remove the diaphragms from the plates.
29. If rear housing seal requires replacement, use a
blunt punch or 1-1/4" socket to drive seal from
housing.
Cleaning
Use denatured alcohol to clean all metal, plastic and
rubber parts of the power cylinder. Immerse parts in
cleaning fluid and use a hair brush to remove foreign
matter. Blow out all passages, orifices and valve holes.
AIR DRY and place cleaned parts on clean paper or
lint-free cloth. If slight rust is found on inside surface of
power cylinder housing, polish clean with crocus cloth or
fine emery cloth, then follow with a thorough cleaning as
outlined above.
Use o f gasoline, kerosene, anti­
CAUTION:
freeze alcohol or any other cleaner with even a
trace o f mineral oil, will damage rubber parts.
Inspection
Wipe cleaning fluid from all parts and carefully inspect
each part for damage and wear. Inspect rubber parts for
cuts, nicks and distortion. These rubber parts are the key
to control of air flow and should account for the majority
of troubles traceable to leakage. If there is any question
whatever as to serviceability of any part, replace it.
Refer to "Inspection C hart" for more detailed
installations.
Assembly
Be sure to keep parts clean until
CAUTION:
reassembly. Re-wash at reassembly if there is
any occasion to doubt cleanliness - such as
Fig. 4 D -R em oving Valve O perating Rod, Retainer,
Filters and Poppet
parts dropped or left exposed fo r eight hours or
longer.
I f there is any suspicion o f contamination or
any evidence o f corrosion, completely flush the
car hydraulic brake system in accordance with
the Chassis Service Manual.
Lubricate rubber, plastic and metal friction
points with Delco Silicone Lube #5459912 (or
equivalent).
1. If the rear housing seal was removed, press the new
seal into this cavity in the rear housing using Tool
J-22677 (fig. 7D). The flat rubber surface of the seal
should be 5/16" below the flat, inside surface of the
rear housing.
BRAKES 5-27
OVERHAUL MANUAL