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Section 3
Mechanical Brakes
DLM Brake
(Duplex Lever Mechanical)
Description
The DLM brake is a two-shoe mechanically
actuated brake. The brake is available in 7.25" x
1.5", 10" x 1.5" and 13.375" x 2" (184.1 mm x 38.1
mm, 254. mm x 38.1 mm and 339.7 mm x 50.8
mm) sizes. Figures 3.4 and 3.5.
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.
DLM BRAKE
Disassemble DLM 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.
6. Remove the brake drum using standard
procedures.
7. Use a brake shoe return spring removal tool
to remove the two brake shoe return springs.
8. Remove both brake shoe and lining
assemblies.
9. Lift the brake actuator lever from the pawls
and remove the roller from the actuator pawl
pin under the arm of the lever.
NOTE: Some smaller DLM brakes use a roller on
each pawl.
10. If complete disassembly is necessary,
remove the brake backing plate capscrews
and washers. Make a note of how the brake
backing plate is mounted. Use the position of
the actuator lever opening as a reference
point.
11. Clean and inspect all parts. Refer to Section 4.
