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TM 5-4210-230-14&P-1
VEHICLE MAINTENANCE
BRAKES HYDRAULIC
The vehicle may be equipped with either a single hydraulic brake system (codes 04011 or 04058) or split hydraulic system
(codes 04044, 04055 or 04059) depending upon the front axle gross weight rating.
Code
Type System
Identification
04011
Single
A. One hydraulic fluid line from master cylinder which is
under hood mounted on dash panel.
B. Vehicles with frame mounted hydrovac.
C. Vehicles with 5,000, 6,000 and 7,500 lb. front axles.
04058
Single
A. One hydraulic fluid line from master cylinder which is
under hood mounted on dash panel.
B. Vehicles with frame mounted hydrovac.
C. Vehicles with 9,000 10,000 and 12,000 lb. front axles.
04055
Dual Power
A. Split hydraulic master cylinder with two compartment
reservoir, two hydraulic fluid lines and is mounted on
DPB booster.
B. Dual Power Brake (DPB) booster with vacuum power
chamber and a hydraulic power booster which receives
hydraulic source from separate hydraulic pump (power
steering). DPB booster is mounted under hood on dash
panel.
C. Vehicles w/5,000, 6,000 and 7,500 lb. front axles.
04044-04059
Hy-Power
A. Split hydraulic master cylinder with two compartment
reservoir, two hydraulic brake fluid lines and mounted
on the Hy-Power booster assembly.
B. Hy-Power booster is a hydraulic assist system which
receives hydraulic assist from separate hydraulic pump
(power steering). It also has an electric power backup
pump. It is under hood mounted on dash panel.
C. Vehicles with 5,000 thru 12,000 lb. front axles.
BRAKES (HYDRAULIC)
The hydraulic brakes on some models are self-
adjusting. The automatic brake adjuster maintains proper
clearance between the brake shoe lining and drum during the
service life of the lining.
The automatic brake adjuster operates when the
brakes are applied while the vehicle is moving rearward. It
should be noted, however, that the automatic adjustment
feature does not eliminate the need for periodic inspection of
the brake system (wheel cylinders, master cylinder, lines and
hoses, etc.) or the replacement of worn or damaged linings or
other parts.
Air Cleaner
Brake Vacuum Power Cylinder (Hydrovac)
Replace: Every 12,000 miles (19,000 kilometers)
Location: Adjacent to Hydrovac
inside left frame rail under cab.
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