Power Train Disassembly & Assembly
Brake Adjustment Inspection
NOTE : Brake adjustment must be checked with 80 ~
90 psi air pressure in the brake chambers when the
brakes are fully applied. One hundred psi in the air
tanks with the ENGINE OFF will supply 80 ~ 90 psi
in the chambers when the brakes are fully applied.
•
If necessary, run the engine to increase the
pressure to 100 psi.
•
If necessary, turn off the engine and apply and
release the brakes to decrease the pressure to 100
psi.
1. Check the gauges in the cab to make sure that the
air pressure in the tanks is 100 psi with the engine
off and spring chambers released.
2. With the brakes NOT APPLIED, measure the
distance from the bottom of the air chamber to the
center of the clevis pin on all the brakes. Record
each dimension.
3. Have another person apply and hold one full brake
application.
4. Repeat step 2 and measure WITH THE SERVICE
BRAKES APPLIED. Record each dimension.
5. Release the brakes.
6. Calculate the adjusted chamber stroke of each
brake:
A. Subtract the dimension that was measured in step
2 from the dimension measured in step 4.
B. The difference between the two dimensions is the
adjusted chamber stoke. The adjusted chamber
stroke MUST NOT BE GREATER THAN THE
STROKE LENGTH SHOWN for that size air
chamber.
C. If the adjusted chamber stroke you measured is
greater than the maximum stroke shown, inspect
the slack adjuster.
Maximum Stroke at Which Brake Must be Adjusted.
80 - 90 PSI (550 - 620 kPa) Air Pressure In the Air
Chamber. Clamptype Air Chamber.
Chamber Stroke Length
Type (Size) Not to Exceed :
D100/120
30 2inches (50.8 mm)
D110/130S-5
D150
36 2-1/4 inches (57.1 mm)
D160S-5
69
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