MERITOR-TP-9853
MERITOR WEDGE BRAKES
MAINTENANCE MANUAL NO. 4R
FEBRUARY 1995
MERITOR-TP-9853 - Page 9 of 32
Section 1
Introduction
5
Identification Tags
An identification tag is typically located on the
dust shield.
Figure 1.5
explains the meaning of the
information on the tag.
Brake Application
Air pressure moves the air chamber diaphragm
and push rod. The push rod moves the wedge
assembly forward, and the wedge head forces
apart the two rollers and plungers. The outward
movement of the plungers forces the shoes and
linings against the drum, which stops the vehicle.
Figure 1.6.
Brake Release
When air pressure is released, the wedge return
spring retracts the wedge from between the
rollers. The movement of the wedge forces the
push rod and air chamber diaphragm back to their
original positions. At the same time, the shoe
return springs retract the shoes, and the shoes
push the plungers back into the housings.
Figure 1.7.
Figure 1.4
Figure 1.5
RDA BRAKE
RDA-15 70
R = ROCKWELL
S = SINGLE AIR CHAMBER
D = DUAL AIR CHAMBERS
BRAKE
DIAMETER
15 = 15"
12-1/4 = 12.2"
BRAKE
WIDTH
40 = 4.0"
50 = 5.0"
60 = 6.0"
70 = 7.0"
A = AIR ACTUATED
H = HYDRAULIC ACTUATED
Figure 1.6
Figure 1.7
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