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Page Title:
HYDRAULIC BRAKE SYSTEM |
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 TM 10-3930-644-14&P
D. DRIVE UNIT (CONT)
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Excessive back-
Worn splines on jackshaft/axle-
Replace jackshaft/axleshaft.
lash on unit.
shaft.
Worn ring gear or pinion.
Replace gear and pinion.
Loose or worn universal joints.
Tighten or replace.
E. HYDRAULIC BRAKE SYSTEM
TROUBLE
PROBABLE CAUSE
POSSIBLE SOLUTION
Pedal goes to
Normal lining wear.
Check. repair. or replace self-adjuster.
toe board.
Low fluid level in master cyl-
Fill reservoir and bleed lines.
inder.
External leak in brake system
Check system for leak and repair.
or leak past master cylinder
piston cup.
Air trapped in hydraulic system.
Bleed system.
Both brakes
Pedal lash not correctly ad-
Readjust to correct lash.
drag.
justed.
Mineral oil in brake system.
Clean out system. replace cups in wheel cyl-
inders and master cylinder. Refill master cyl-
inder with specified brake fluid and bleed
brake system.
Breather port in master cylinder
Clean out breather port.
clogged.
One wheel drags.
Weak or broken brake shoe re-
Replace broken or weak springs.
turn springs.
Brake shoe or drum clearance
Check, repair. or replace self-adjuster.
too small.
Tight wheel bearing.
Readjust.
Obstruction in brake line.
Remove obstruction or replace line.
Swollen wheel cylinder piston
Replace defective or damaged parts.
cups or piston binding.
Truck pulls to
Grease or brake fluid on brake
Replace with new lining.
one side.
lining.
Loose wheel bearings.
Readjust.
Different makes of brake lining.
Make sure same type of lining is used at each
wheel.
Brakes incorrectly set.
Readjust.
Uneven tread wear.
Replace tires.
2-110
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