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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
CHAPTER IV
TROUBLE SHOOTING
Problems pertaining to the brake system are usually those which appear in the TROUBLE SHOOTING CHART. Brake troubles
are easily diagnosed if the problem is understood. The driver may report certain symptoms; however, the report may not be of any
benefit in your analysis. Be sure to have the driver tell you which of the problems he has encountered. In some instances, you may
want to road test the vehicle to assist you in your analysis.
PROBLEM
POSSIBLE CAUSE
REMEDY
Low Pedal (excessive pedal travel
to apply brakes)
Shoes improperly adjusted. Worn linings.
Adjust brakes. Replace lining.
Brake shoes bent or distorted.
Fill reservoir with approved fluid to correct
level.
Air in system.
Bleed system and fill reservoir to correct
level.
Poor quality brake fluid (low boiling point).
Replace with approved brake fluid.
Soft or weak hoses (expanding under
pressure).
Replace.
Brake drums cracked or too thin (expanding
when hot).
Replace.
Automatic adjuster corroded, distorted or
broken.
Repair or replace and lubricate.
Leak in system.
Check system for leaks with brakes applied.
Repair leaks.
Power cylinder leakage.
Repair or replace power cylinder assembly.
Dragging
Brakes
(slow
or
incomplete release of brakes, either
one wheel or all wheels)
Mineral oil in system.
Disassemble, clean and flush system.
Replace piston cups through-out system.
Fill system with approved brake fluid, bleed
system and refill with fluid.
Insufficient pedal height.
Check pedal for alignment, bind or being
bent;
incorrectly
positioned
stop
light
switch.
Shoes improperly adjusted.
Adjust brake shoes.
Shoes distorted or incorrect.
Replace with new lined shoes.
Linings soiled with mineral oil or grease.
Replace linings.
CTS-2055S Chapter IV Page 1
PRINTED IN UNITED STATES OF AMERICA
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