Wheel Brake Service; Cleaning And Inspection; Socket, 7/16", 3/8" Drive; Socket, 9/16", 3/8" Drive - Ezgo WorkHorse ST 480 Technician's Repair And Service Manual

Read all of Section B and this section before attempting any procedure. Pay particular attention to all Notes, Cautions and Warnings

WHEEL BRAKE SERVICE

Tool List
Dust mask ................................................................... 1
Safety glasses............................................................. 1
Socket, 3/4", 1/2" drive................................................ 1
Ratchet, 1/2" drive....................................................... 1
Wheel chocks.............................................................. 4
Hydraulic floor jack...................................................... 1
Jack stands ................................................................. 2
Brush........................................................................... 1
Wheel cylinder clamp .................................................. 1
Pliers ........................................................................... 1
Wrench, 9/16" ............................................................. 1
Wrench, 10 mm........................................................... 1
Cleaner ................................................................... A/R
Shop towels ............................................................ A/R

Socket, 7/16", 3/8" drive.............................................. 1

Torque wrench, 3/8" drive, in. lbs. ............................... 1
Wire brush................................................................... 1
Grease .................................................................... A/R
High temperature lubricant...................................... A/R
Socket, 10 mm, 3/8" drive ........................................... 1

Socket, 9/16", 3/8" drive.............................................. 1

Locking pliers .............................................................. 1
Thread locking compound....................................... A/R
Disassembly
!
on wheel brakes. Do not use pressurized air
t o b l o w d u s t f r o m b r a k e a s s e m b l i e s .
Replace both brake shoes on both wheels if
one or more shoes are worn below .06"
(1.5mm) thickness at any point.
Do NOT touch any of the wheel brake
mechanism except as instructed.
Do NOT use a commercial brake cleaner unless the
entire brake has been disassembled.
Be sure that the parking brake is released.
Loosen rear wheel lug nuts and lift rear of vehicle per
Section B.
Remove wheel and drum. See 'BRAKE DRUM
REMOVAL AND INSTALLATION' on page D-5. Remove
excess dust and dirt from the drum with a brush.
Qty. Required
Wear a dust mask
!
and eye protection
whenever working
Repair and Service Manual
Remove any accumulated brake dust from the wheel
brake assembly with a brush.
Install wheel cylinder clamp, then unhook upper and
lower shoe to shoe springs.
Remove parking brake strut and lever.
Remove shoe hold-down springs and remove shoes.
If the wheel cylinder must be removed, begin by loosen-
ing and removing the brake line from the back of the
wheel cylinder. Next remove the wheel cylinder bolts and
remove the wheel cylinder from the backing plate.

Cleaning And Inspection

!
ing will make the drum too thin causing drum
and brake failure which could cause severe
injury or death.
Inspect the brake drum. Look for a blue coloration or blis-
tered paint that would indicate that it has overheated.
Check for evidence of scoring. Check for excessive wear
indicated by the friction surface being significantly worn
and leaving a ledge of unworn drum. Inspect the splines
for galling, wear and corrosion. If any of these problems
are found, the drum must be replaced.
Visually inspect the axle seal for oil leakage and the con-
dition of the thrust washer. If oil is present, see REAR
AXLE section.
Verify the inner brake drum washer is present and check
its condition. Replace if damaged or missing.
Clean the backing plate with an approved cleaner for this
purpose.
!
gouging is not repairable and must be replaced with
a new wheel brake assembly. Always replace wheel
brake assemblies in pairs.
Inspect the backing plate. Inspect for gouges, galling or
other damage, particularly where the backing plate is
contacted by the brake shoes. Be sure shoe ledges are
smooth and free of rough edges. Replace both wheel
brake assemblies if any gouges or galling is found.
Measure the brake shoe thickness. Measure at the most
worn area. Brake shoe thickness must never be less
than .06" (1.5 mm) at any point on the shoe. It is normal
for the shoes to show more wear at the leading and trail-
BRAKES
The drum must not be
!
turned to 'true' a worn
friction surface. Turn-
A backing plate assem-
!
bly that shows any indi-
cation of galling or
Page D-7