MERITOR-TP-9853
MERITOR WEDGE BRAKES
MAINTENANCE MANUAL NO. 4R
FEBRUARY 1995
MERITOR-TP-9853 - Page 19 of 32
Section 4
Assemble Brakes
15
3. Install the anchor plunger in its bore so that
the slot in its side aligns with the hole for the
plunger guide. Install the plunger guide to
hold the plunger in place. Tighten the plunger
guide to 15-25 lb-ft (20-34 N•m).
CAUTION
When you service a pre-1982 unit, replace
adjuster components (actuator, adjusting plunger
and pawl assembly) on both sides of the axle at
the same time. Do not mix pre-1982 components
(old style) with components manufactured from
1982 (new style) on the same axle. Damage to
components can result. Figure 4.3.
4. Install the adjusting plunger assembly as
follows:
a. Thread the adjusting bolt into the actuator
until the end of the bolt is two or three
threads from the bottom of the actuator.
The bolt
must
turn freely. Back out the bolt
when you feel resistance, which means that
the seal is pinched between the bolt and the
actuator.
CAUTION
When the adjusting bolt extends past the bottom
of the actuator or does not turn freely, the
automatic adjuster will not work correctly.
Stopping distances will increase as the linings
wear and the brake fails to adjust. Damage to
components can result.
b. Install the plunger in its bore. The slot in the
plunger must align with the hole for the
pawl.
c. Install the actuator and adjusting bolt inside
the plunger. Install the pawl assembly so
the pawl fits through the slot in the plunger
and engages the teeth on the actuator.
Tighten the pawl to 15-25 lb-ft (20-34 N•m).
5. Use the correct size seal driver to seat the
seals in the housing. For
RSA
brakes, use a
1-3/8-inch diameter driver with a 7/8-inch x
1-inch notch to clear the adjusting bolt. For
RDA
brakes, use a 1-7/8-inch driver with a
1-3/16-inch notch to clear the adjusting bolt.
Figure 4.4.
Figure 4.2
Figure 4.3
ANCHOR
PLUNGER SEAL
ADJUSTING
PLUNGER SEAL
PRE-1982 DESIGN
POST-1982 DESIGN
PLUNGER
PLUNGER
ACTUATOR
PAWL
ACTUATOR
PAWL
Figure 4.4
SEAL DRIVER
FOR RS BRAKES
SEAL DRIVER
FOR RD BRAKES
1-3/8"
7/8"
1"
1-7/8"
1-3/16"
1"
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