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BRAKES-SERVICE
5-9
COVER
GASKET
WASHER
CONNECTOR
PRIMARY CUP
N K l 3 6
Fig. 1 L M a r t e r Cylinder Assembly
Disassembly (Fig.
7 01
NOTE:
Clean the outside of the master cylinder
thoroughly, then drain
all the brake fluid.
(1)
Remove the piston stop flange attaching screws
and remove the dust boot, push rod and piston as-
sembly. (Do not remove the push rod from the pis-
ton.)
(2)
Remove the brass washer between the piston
and the cup. Remove the master cylinder primary cup,
spring valve and seal from the master cylinder.
(3) Wash the master cylinder bore with clean brake
fluid and inspect for scoring or pitting.
If the master cylinder piston is badly scored or cor-
roded, replace it with a new one. The primary and sec-
ondary cups and valve assembly should be replaced
when reconditioning the master cylinder.
Master cylinder walls that have light scratches
or
show signs of corrosion, can usually be cleaned wjth
crocus cloth. However, cylinders that have deep
scratches or scoring may be honed, providing the di-
ameter of the cylinder bore is not increased more
than
.002
inch. A master cylinder bore that does not
clean up at
.002
inch should be discarded and a new
cylinder installed. (Black stains on the cylinder wall
are caused by the piston cups and will do no harm.)
Use extreme care in cleaning the master cylinder
after reconditioning. Remove all dust or grit by flush-
ing the cylinder with alcohol; wipe dry with a clean
lintless cloth and clean a second time with alcohol.
Dry the master cylinder with compressed air then flush
with clean brake fluid. (Be sure the
.028
inch diam-
eter hole compensator part in the master cylinder
bore i s open.)
Assembly (Fig. 701
Before assembling, the piston, cups and valve as-
sembly should be dipped in clean brake fluid.
(1)
Install the seal check valve and spring in the
cylinder with the valve toward the outlet of the cylin-
der.
(2)
Install the master cylinder cup in the cylinder
with the open end of the cup over the closed end of
the return spring.
(3) Install the secondary cup on the master cylinder
piston and install the piston and push rod assembly
in the cylinder with flat brass washer between the pis-
ton and the primary cup.
(4)
Install the dust boot on the push rod and install
the stop flange screws.
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