3
Section 2
Hydraulic Brakes
DLH Brake
(Dual Leading Hydraulic)
Description
The DLH brake is a 17" x 4", (431.8 mm x 101.6 mm)
two cylinder hydraulic actuated brake. The dual
leading shoe design permits balanced, equal torque
action in both forward and reverse directions. Each
shoe transfers its force into an anchor pin during
forward direction stops and into an adjustment bolt
during reverse direction stops. The two wheel
cylinders balance the forces within the brake. The
DLH brake has manual brake adjustment.
Figures 2.1 and 2.2.
Disassemble DLH 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. Remove the wheels and brake drums from the
axle. If necessary, manually retract the brake
shoes by rotating the adjustment bolt star wheel
so that the brake drums will clear the linings.
5. Remove the four brake shoe return springs from
their pins on the spider.
6. Support each shoe with one hand and remove the
two shoe guide nuts and washers from their bolts.
7. Disassemble the shoes, anchor pins, star wheel
clips and adjustment bolts.
8. If complete disassembly is necessary, disconnect
the hydraulic brake tube and hydraulic brake
lines. Remove the wheel cylinder capscrews and
the cylinders.
Figure 2.1
DLH BRAKE
Figure 2.2
NOTE: Some duplicate parts are not shown.
1. Nut
2. Washer
3. Shoe and Lining Assy.
4. Shoe Guide Bolt Spacer
5. Shoe Guide Bolt
6. Shoe Return Spring
7. Brake Spring Pin
8. Wheel Cylinder Assy.
9. Spider
10. Hydraulic Tube
11. Adjuster Starwheel
12. Adjuster Bolt
13. Starwheel Clip
14. Capscrew
15. Capscrew
16. Hydraulic Fitting
17. Shoe Return Spring
18. Anchor Pin
19. Lock Washer
20. Cotter Pin
21. Washer
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.
