Pontiac FIREBIRD 1972 Service Manual page 456

SINGLE DIAPHRAGM POWER BRAKE-BENDIX 5B-9
assembly is provided in repair kit.
Fig. 5B-6 Tools for Disassembly of Power Unit
4. Remove front piston assembly, front return spring
and retainer. Slide primary cup and protector off nose
of front piston. Use dull scribe to lift both secondary
seals from the grooves at rear end of front piston.
Discard all old rubber parts.
INSPECTION
-
CLEANING
CAUTION: It is important that all parts be
placed on a clean paper or cloth a h being
cleaned to prevent the possibility of dirt being
assembled into unit or grease contacting any
rubber parts.
Thoroughly wash all parts in alcohol and air dry. Blow
dust and cleaning fluid out of all internal passages. If
inside of front housing is slightly scored or scratched,
clean with crocus cloth or fine emery cloth. If scratches
cannot be removed, replace housing.
All rubber parts should be replaced, regardless of condi-
tion, and those parts which come in contact with brake
fluid should be rewashed in clean alcohol before reassem-
bly.
INSPECT POWER BRAKE ASSEMBLY
Inspect all parts for scoring, pitting, dents or nicks. Small
imperfections can be smoothed out with a fine emery cloth
or parts replaced if badly nicked, scored, or otherwise
damaged.
INSPECT HYDRAULIC MASTER CYLINDER
ASSEMBLY
Inspect bore from the open end. The bore should be free
of scoring, rust pitting or etching. If any of these are
DIAPHRAGM
RETURN SPRING DIAPHRAGM PLATE
I
HYDRAULIC
(POWEIR PISTON)
Fig. 58-7 Power Piston
-
Exploded View