MERITOR-TP-9853
MERITOR WEDGE BRAKES
MAINTENANCE MANUAL NO. 4R
FEBRUARY 1995
MERITOR-TP-9853 - Page 8 of 32
Section 1
Introduction
4
WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.
NOTE:
This manual only covers air actuated
wedge brakes. For information on hydraulic
actuated wedge brakes, refer to Maintenance
Manual No. 4P,
Stopmaster
h
Off-Highway Heavy
Duty Brakes
.
Meritor Stopmaster
h
brakes for on-highway
vehicles are air actuated wedge brakes. The
brakes come in two basic models: single actuated
(RSA) and dual actuated (RDA). Both types of
brakes are available with 12-, 14- or 16-degree
wedge angles.
Single Actuated Brakes
RSA brakes are typically used on steering axles
with a capacity of 12,000 pounds or less. RSA
brakes are mounted on a stamped backing plate
that is bolted to the axle. The single plunger
housing has two adjusting plungers and is bolted to
the backing plate. RSA brakes are 15-inches in
diameter and 4-inches wide. RSA brake shoes
have coiled return springs and are held in place by
anti-rattle rods.
Figure 1.1.
Dual Actuated Brakes
RDA brakes are typically used on drive axles,
trailer axles and steering axles with a capacity
greater than 12,000 pounds. Each of the two
plunger housings on an RDA brake has one
anchor plunger and one adjusting plunger.
RDA brakes for trailers have forged spiders that
are welded to the axle and plunger housings that
are bolted to the spider. Trailer axle brakes are
12-1/4-inches or 15-inches in diameter and
7-inches wide.
Figure 1.2
and
Figure 1.3.
The brake
shoes have coiled return springs and are held in
place by clips.
RDA brakes for drive axles and steering axles have
cast spiders that are bolted to the axle. The
plunger housings are cast integrally with the
spider. These brakes are 15-inches in diameter and
are available in widths of 5-, 6- or 7-inches. The
brake shoes have coiled return springs and are
held in place by clips.
Figure 1.4.
Figure 1.1
RSA BRAKE
Figure 1.2
Figure 1.3
RDA BRAKE
RDA BRAKE
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