2-8
GROUP 2 - Brakes
POSSIBLE CAUSES OF TROUBLE
Mechanical Resistance at Pedal or Shoes
Brake Line Restricted
Leaks or Insufficient Fluid
Improper Tire Pressure
Distorted
or
Improperly Adjusted Brake Shoe
Faulty Retracting Spring
Drum Out
of
Round
Lining Glazed or Worn
Oil or Grease on Lining
Loose Carrier Plate
Loose Lining
Dirt on Drum-Lining Surface
Faulty Brake Cylinder
Dirty Brake Fluid
Faulty Master Cylinder
Air in Hydraulic System
Self Adjusters Not Operating
Insufficient Shoe-to-Carrier Plate Lubrication
Tire Tread Worn
Poor Lining to Drum Contact
Loose Front Suspension
Threads Left by Drum Turning Tool Pulls Shoes Sideways
Cracked Drum
One Section Dual Brake System
Is
Inoperative
Differential Pressure Valve Not Centered
Wiring to Warning Lamp Switch Is Grounded
Warning Lamp Switch
Is
Grounded
Warning Lamp Is Burned Out
Warning Lamp Switch Has an Open Circuit
Wiring to Warning Lamp Has Open Circuit
TROUBLE SYMPTOMS
One
Brake Drags
X
X
X
X
X
X
X
X
X
All
Brakes Drag
X
X
X
X
X
Hard Pedal
X
X
X
X
Spongy
Pedal
X
X
Car
Pulls
to
One Side
X
X
X
X
X
X
X
X
X
One
Wheel Locks
X
X
X
X
X
X
Brakes
Chatter
X
X
X
X
X
X
X
Excessive
Pedal
Travel
X
X
X
X
X
X
X
Pedal Gradually Goes
to
Floor
X
X
Brakes
Uneven
X
X
X
Shoe
Click After Release
X
X
Noisy
or
Grabbing Brakes
X
X
X
X
X
X
Brakes
Do Not
Apply
X
X
X
X
X
X
Brakes
for the
Respective System Do
Not
Apply
X
Warning Lamp Stays
Lit.
X
X
X
X
Pedal Gradually Moves Toward Floor
or
Dash
Panel
X
X
Warning Lamp Does
Not Light
X
X
X
FIG. 10—Drum Brake (and General System) Trouble Symptoms and Possible Causes
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