SERVICE MANUAL
FOUNDATION BRAKE GROUP
DISASSEMBLY
Variations in disassembly procedure may be required as
different types of brakes have been used on IH vehicles.
Some typical brakes used are single and double anchor
cam actuated types as well as wedge type actuated
brakes. Refer to the particular Service Manual section
for complete details pertaining to wedge-type brakes.
The disassembly instructions contained herein have
been arranged as follows:
Remove Wheel, Hub and Drum
Brake Groups with Backing Plate
Brake Groups with Spider (Cast Type Mounting
Bracket)
Detailed
information
covering
disassembly
and
reassembly of various components such as slack
adjusters, brake chambers and brake shoes will be
found elsewhere in this section.
Remove Wheel, Hub and Drum
1.
Position vehicle on floor stands.
2.
Release parking brake. If vehicle is equipped
with spring brake chambers, chambers should
be manually released or "caged" to avoid an
automatic application of spring brake chambers
while vehicle is being serviced. Refer to proper
Parking Brake, Spring Brake Chamber section
for detailed instructions covering manual release
of spring brake.
3.
It
may
be
necessary
to
back
off
brake
adjustment to obtain enough clearance for drum
removal (Fig. 3).
4.
Remove brake drum assembly as determined by
the type of drum mounting. Two variations will
be found in drum-to-hub mounting.
a.
Inboard mounted drum will be secured to
the hub assembly on the brake group side
of hub. This type of mounting will apply to
all cast wheels and some disc wheels.
With this type of drum mounting, the wheel,
hub and drum is removed as one assembly
(Fig. 4).
b.
Outboard mounted drums will be secured
between the wheel and hub. This mounting
will
only
apply
to
some
disc
wheel
installations.
When outboard mounted drum brake groups are
serviced, the wheels are removed, then the drum
can be removed without disturbing the hub
assembly (Fig. 5). This will eliminate wheel
bearing repacking and adjustment.
Further identification and service procedures will be
found in the Wheels, Rims and Tires section.
Fig. 3 Backing Off Brake Adjustment
Fig. 4 Using Wheel Dolly to Remove Wheel, Hub and
Drum Assembly
CTS-4080W - Page 5
