9
Section 2
Hydraulic Brakes
8. Allow the shoe to rotate about the abutment
ends until the return spring tension is
relaxed. Remove the return springs, brake
shoe and the brake lever assembly.
9. Use the same procedure (Steps 6 and 7) to
disassemble the other brake shoe and lever.
10. Remove the brake shoe adjusting bolts.
11. If complete disassembly is necessary,
disconnect the hydraulic line, and remove the
wheel cylinder capscrews and the wheel
cylinder.
12. Clean and inspect all parts. Refer to Section 4.
Assemble DH Brake
CAUTION
Do not permit grease to contact the brake drum
or linings. Grease on the linings can cause poor
brake performance. Contaminated linings MUST
be replaced.
1. Before assembly, apply a thin layer of
Meritor specification 0-616 brake lubricant
such as Texaco Thermatex EP-2 grease or
equivalent (listed on page 31) to the
following parts:
a. Brake shoe adjustment bolts.
b. The edges of the brake levers and shoes
that slide against each other.
c. Push rod ends of the brake levers and
cylinder.
2. Install the wheel cylinder to the backing
plate. Tighten the wheel cylinder capscrews
to 25-35 lb. ft. (34-47 N•m).
3. Install the two brake shoe adjusting bolts
until the bolts are fully retracted.
4. Install the brake levers in position so that the
ends match with the push rod at the top and
the adjusting bolts at the bottom.
NOTE: There are right and left hand brake levers.
Make sure that the levers are installed in the
correct positions.
5. Attach the short ends of the shoe return
springs into the brake shoe web holes of one
brake shoe.
6. Attach the long end of the upper shoe return
spring to the pin on the spider.
7. Attach the long end of the lower shoe return
spring into the end of the adjusting bolt.
8. Lift the shoe and lining assembly over the
shoe guide bolt and into position on the
brake lever, pivoting about the abutments.
9. Assemble the washer and nut on the shoe
guide bolt. Tighten the nut until the cotter
key can be put into its hole in the guide bolt.
The shoe and lever must be able to move
freely.
10. Lock the guide bolt nut with the cotter key.
11. Use the same procedure (Step 5 -10) to install
the other shoe.
12. Connect the hydraulic line.
13. Bleed the hydraulic system after all brakes
are assembled. (See page 19).
Adjust DH Brake
NOTE: Each brake shoe must be adjusted
separately.
1. The DH brakes are adjusted through the slots
in the rear of the backing plate. Figure 2.10.
Figure 2.10
