A SERVICE OF

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24
Section 3
Mechanical Brakes
DM Brake
(Duplex Mechanical)
Description
The DM brake is a two shoe mechanically
actuated brake. The brake is available in 7.125" x
2" (180.9 mm x 50.8 mm), sizes. Figures 3.6
and 3.7.
WARNING
Some brake linings contain asbestos fibers, a cancer
and lung disease hazard. Some brake linings
contain non-asbestos fibers, whose long-term
effects to health are unknown. You must use
caution when you handle both asbestos and
non-asbestos materials.
!
Disassemble DM Brake
WARNING
To prevent serious eye injury, always wear safe
eye protection when you perform vehicle
maintenance or service.
WARNING
Block the wheels to prevent the vehicle from
moving. Support the vehicle with safety stands.
Do not work under a vehicle supported only by
jacks. Jacks can slip and fall over. Serious personal
injury can result.
1. Make sure the vehicle is on a level surface.
2. Place blocks under the wheels not being serviced
to keep the vehicle from moving.
3. Raise the vehicle so that the wheels to be
serviced are off the ground. Support the vehicle
with safety stands.
4. Disconnect the drive shaft using standard
procedures.
5. Release the brake.
!
!
Figure 3.6
DM BRAKE
Figure 3.7
ADJUSTING BOLT
ABUTMENT PIN
BRAKE SHOE AND
LINER ASSEMBLY
LEVER WEDGE
ASSEMBLY
ADJUSTING NOTCH
CLIP SPRING
BRAKE SHOE
LEVER
BRAKE SHOE RETURN
SPRING
WEDGE ACTUATING
LEVER
(PRESSURE
POINT)
BACKING PLATE AND
ABUTMENT BRACKET
ASSEMBLY
ADJUSTING BOLT
SLOT COVER
ADJUSTING BOLT