11
Section 2
Hydraulic Brakes
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 FSH 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.
Figure 2.14
CAUTION
Do NOT apply more than 20 lb. ft. (27 N•m)
torque to the heads of the adjustment bolts in
step 4. More torque can damage the automatic
adjustment assemblies. Do NOT use a power
wrench on the adjustment bolts.
4. Remove the wheels and brake drums from the
axle. If necessary, manually retract the brake
shoes by rotating the adjustment bolts so that
the brake drums will clear the linings. To
retract each brake shoe rotate the adjustment
bolt heads 1/8 of a turn. Figure 2.14.
5. Remove the retainer spring clip from over the
“U” spring.
BACK VIEW
TO RETRACT
SHOE
TO RETRACT
SHOE
TO EXPAND
SHOE
TO EXPAND
SHOE
Figure 2.13
BRAKE SHOE ACTS
AS PUSH ROD
12.5" x 2.25" FSH
(317.5 mm x 57.1 mm)
10.5" x 2.25", 1.5"
(266.7 mm x 57.1 mm, 38.1 mm)
12.5" x 2.25" FSH
(317.5 mm x 57.1 mm)
8" x 1.75" FSH
(203.2 mm x 44.4 mm)
AUTOMATIC
ADJUSTMENT
MANUAL
ADJUSTMENT
PARKING BRAKE
LEVER
“U”
SHOE
RETURN
SPRING
COIL SHOE
RETURN
SPRING
PUSH ROD ON
CYLINDER
Some of the designs of the FSH brake are shown
in Figure 2.13.
