Kalmar Ottawa t2, Maintenance Manual

Page: 63 / 262

54 4.3 Brake System – 4 Brakes
Maintenance Manual Ottawa T2 4x2
4.3.15 Automatic Traction Control
(Optional)
page –
Description
Some vehicles that are equipped with ABS may also be
equipped with full-time automatic traction control (ATC). The
ATC indicator lamp blinks when ATC is working.
ATC uses the ABS wheel sensors. It compares front wheel
speed to rear wheel speed and left rear wheel speed to right
rear wheel speed. When a set ratio is exceeded, ATC applies
the rear brakes to the appropriate wheel end.
ATC operates only at speeds less than 25-30 miles per hour
(40-48 kilometers per hour). At higher speeds, vehicle reaction
to a sudden application of the brakes on one side may cause
loss of driver control.
4.3.16 Manually Releasing Tractor Spring
Brakes (Caging)
page –
Description
When air pressure in the system drops below approximately 43
psi, the spring parking brakes will apply automatically. To re-
lease the spring brakes, the air pressure must be returned to 70
psi. If the system cannot be recharged and the vehicle must be
moved, the spring parking brakes can be released manually
(caged).
To release the spring brakes, the actual spring in the brake
canisters must be mechanically compressed. A release stud, or
spring caging tool, must be used to manually compress the
brake chamber.
D A N G E R
Never manually release (cage) the spring brakes be-
fore the wheels are properly blocked. If the wheels are
not properly blocked before releasing the spring
brakes, the vehicle may move unexpectedly. This
could result in serious injury or death.