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TM 9-2320-270-10
MANUALLY RELEASING AND RESETTING SPRING BRAKES
An air system pressure loss to below 60 psi (414 kPa) will allow spring brake units on the
tandem rear axles to apply the rear brakes. To move the M911 Truck Tractor, the power
springs in the spring brake chambers must be compressed. When there is not enough air pres-
sure, the springs must be compressed and reset manually. This is done in the following steps:
Releasing Brakes by Compressing Spring Brake Power Springs
1.
2.
3.
4.
5.
WARNING
Failure to block wheels before releasing the spring brakes could result in vehicle
runaway, causing injury to personnel and damage to equipment.
NOTE
There are four spring brake chambers on the M911 Truck Tractor, There is
one left and one right forward of front tandem axle, and one left and one
right behind rear tandem axle. All four spring brake chambers operate the
same. Only the right rear is addressed below.
Chock wheels.
Open two hinged handles (1) on spring brake chamber (2).
Rotate handles (1) clockwise until center bolt head (3) sticks out about 4 inches
(10 cm) or reaches stop.
Release and fold handles.
Repeat steps 2, 3 and 4 for remaining three spring brake chambers (2).
Resetting Brakes by Releasing Spring Brake Power Springs
1.
2.
3.
4.
5.
Open two hinged handles (1) on spring brake chamber (2).
Rotate handle (1) counterclockwise until center bolt (3) is flush with top of hex
nut (4).
Fold hinged handles (1) over hex nut (4).
Repeat steps 1, 2, and 3 for remaining three spring brake chambers (2).
Remove chocks.
2 - 1 2 2
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