BRAKES - AIR
TRUCK SERVICE MANUAL
If brakes are poor or do not apply - check system
pressure at source and at brakes possible restriction or
A high temperature water-proof grease IH 251 HE.P.
leak in brake lines, valves, etc. brakes out of adjustment
grease or equivalent to NLGI # 2 multi-purpose lithium
leaking diaphragm or wheel cylinder cup.
grease is recommended for lubricating the brake
Uneven braking or lining wear - ruptured diaphragm
wedge rod out of push rod socket rollers and cage out of
plunger socket corroded or frozen plungers brakes out
of adjustment grease on lining glazed lining shoes
Texaco Thermotex EP #1
installed backward combination linings.
Shell Darina #1
Marathon 528 H.D.
Automatic Adjusters not working - adjusting pawl
Sunaplex #1 EP
installed backward pawl spring collapsed or missing bolt
Amdex # 1 EP
frozen in adjusting sleeve detent damaged and allowing
Philube B #1
bolt to rotate with sleeve adjusting plunger in wrong
position in the spider (should be at leading end of shoe)
NOTE: Vehicles operating in extremely cold weather
double lip seals not installed correctly.
(below -400F) may require a grease conforming to MIL-
TROUBLE SHOOTING GUIDE
This section of maintenance instructions is outlined
specifically for the major design improvements of the
The following procedures can be used for the initial
manual adjustment of Stopmaster II wedge brakes.
NOTE: Since the Stopmaster II is an automatic adjusting
brake, periodic manual adjustment is not
Jack or hoist wheels free of ground.
Adjusting bolts have right hand threads. With an
Remove dust cover from adjusting slot two
adjusting spoon,' turn the star-wheel until a heavy drum
places on each brake.
drag is developed. Then back off the bolt to a very light
drag on the drum. Repeat for other shoe on the brake.
Replace dust covers in adjusting slots. Repeat for other
(double actuated) type brakes the adjusting
slots are below the forward and above the rear power