Chrysler RAM TRUCK 2500 1994 Service Manual page 172

4
MASTER CYLINDER 5 - 13
(10) Install cylinder body on reservoir (Fig. 14).
Use a rocking motion to slide the reservoir necks into
the grommets.
RESERVOIR
J9405-12
Fig. 14 Assembling Reservoir And Cylinder Body
(11) Verify that reservoir is properly seated and
that grommets have not slipped out of place.
(12) Bleed master cylinder on bench before install­
ing i t i n vehicle. Refer to procedure i n this section.
MASTER CYLINDER BLEEDING (ON BENCH)
An overhauled, or new master cylinder should al­
ways be bled before installation i n the vehicle. This
practice saves time during brake bleeding because air
in the cylinder will not be pumped into the lines.
The only tools needed for bench bleeding are a vise
and a pair of bleed tubes. Bleed tubes can either be
purchased or fabricated from spare brakelines and
fittings.
The bench bleeding procedure is as follows:
(1) Mount master cylinder i n vise. Clamp vise jaws
on one of the cylinder mounting ears.
(2) Install bleed tubes i n cylinder outlet ports and
direct tube ends into appropriate reservoir chambers
(Fig. 15).
(3) Fill reservoir chambers about 3/4 full with
fresh, clean brake fluid.
(4) Bleed cylinder by stroking cylinder pistons in­
ward then allowing them to return under spring
pressure. Use a wood dowel, or similar tool to stroke
pistons (Fig. 15).
(5) Continue stroking pistons until bubbles no
longer appear i n fluid entering reservoir.
W O O D
FLUID) J9405-71
Fig. 15 Master Cylinder Bleeding
(6) Remove bleed tubes and install plastic plugs i n
cylinder outlet ports. Plugs will prevent fluid loss
and keep dirt out until cylinder assembly is ready for
installation.
(7) Top off reservoir fluid level and install cover
and seal.
MASTER CYLINDER INSTALLATION
(1) Position master cylinder on booster mounting
studs. Be sure booster push rod is aligned and seated
in primary piston.
(2) Install combination valve bracket on mounting
studs. Bracket goes on top of cylinder mounting ears
as shown (Fig. 16).
Fig. 16 Master Cylinder And Combination Valve
Bracket Mounting