NOTE: The following assembly instructions are intended as a general
guideline for the assembly of all MC-4 master cylinder models. The
parts list will vary slightly with each model, but the sequence for
assembly is the same. SHAFT ASSEMBLY
1.Place the stat o-seal, part number ( 13 ), onto the o-ring groove of
the MC4-1 shaft, PN ( 7 ), making sure that the o-ring is not
damaged and is fully seated in the groove.
2.Using Buna o-ring, PN ( 15 ), install it on to the o-ring groove of
the piston, PN ( 5 ). Make sure that the o-ring is not damaged and
is fully seated in the groove.
3.Place the Piston, PN ( 5 ), on the shaft with the flat side of the
piston resting against the stat-o-seal and the beveled side up
PN ( 13 ),
4. Install the valve spring PN ( 12 ), over the threaded end of the shaft
and into the beveled side of the piston, PN ( 5 ).
5 Thread the spring guide, PN ( 12 ), on to the shaft until it is firmly
seated.
END GLAND ASSEMBLY
1. Install 0-ring 2-012, PN ( 8 ), into the interior o-ring groove of the
end gland, PN ( 14 ), making sure that it is seated properly.
2. Install o-ring 2-112, PN ( 9 ), onto the outer o-ring groove of the
end gland, PN ( 14 ), making sure that it is seated properly.
3. Using caution, slide the end gland assembly over the threaded
portion of the shaft, slotted end first. Continue to slide the end
gland on to the shaft until it is seated firmly against the piston.
9
G. MC-4 SERIES MASTER CYLINDER ASSEMBLY
FINAL ASSEMBLY
1. Inspect the housing bore, PN ( 2 ), using adequate lighting to
insure that no burrs, chips or foreign materials are present, and
that no damage has occurred to the bore. Housing bore may be
polished with a Scotch Brite pad (green # 96).
NOTE: Master Cylinders MC-4A, MC-4D, MC-4E & MC-4G
Require a Pedestal PN ( 16 ) on the MC-4A drawing. The pedestal is
inserted into the bore of the housing at this point in the assembly.
The machined end of the pedestal facing up, and the flat end resting
against the bottom of the bore.
2. Place spring, PN (10 ), into the bore of the housing and make
sure that the spring is fully seated.
3. Generously lubricate the piston o-ring, PN ( 15 ), and the end
gland exterior o-ring, PN ( 9 ), with petroleum jelly. Insert
shaft assembly, (piston end first), into the bore of the housing,
PN ( 2 ), making sure that the piston o-ring is not damaged as it
passes over the snap ring groove.
4. With the shaft assembly securely seated in the bore, firmly
press the end gland, PN ( 14 ), below the snap ring groove, and
using a pair of snap ring pliers, install the snap ring, PN ( 4 ),
into place. Make sure that the flat side of the snap ring faces
away from the end gland assembly.
5. Fill assembly with MIL-H-5606 brake fluid. Do Not use
automotive glycol based brake fluids such as DOT 3, DOT
4, and DOT 5.1
MATCO mfg. strongly recommends MIL-H-5606.
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