User Manual

if it is supplying air pressure. If you
don’t desire to use the recovered
vehicle’s brakes, ensure that you
cage the spring brakes before
attempting to move the vehicle.
See How to Manually Lock a Differential on
page 40
6. Follow state/provincial and local
laws that apply to vehicles in tow.
7. Do not tow vehicles at speeds in
excess of 55 mph (90 km/h).
For additional information concerning
heavy duty truck recovery, refer to the
following Technology & Maintenance
Council (TMC) literature.
• Recommended Practice #602–A —
“Front Towing Devices For Trucks
and Tractors”
• Recommended Practice #602–B —
“Recovery Attachment Points For
Trucks, Tractors, and Combination
Vehicles"
• Recommended Practice #626 —
“Heavy Duty Truck Towing
Procedures”
[e-mail] Website: http://
tmc.truckline.com
Manually Release the Parking
Brake
There may be times when there is not
enough air pressure, or the engine's air
compressor is not able to produce enough
pressure, to release the parking brakes. In
such cases, the parking brakes (or Spring
Brakes) can be manually released.
WARNING
DO NOT drive vehicle with malfunc-
tioning brakes. If one of the brake cir-
cuits becomes inoperative, braking
distances will increase substantially
and handling characteristics while
braking will be affected. You could lose
control of your vehicle or cause an ac-
cident. Have it towed to the nearest
dealer or qualified repair facility for re-
pair. Failure to comply may result in
property damage, personal injury, or
death.
WARNING
DO NOT operate a vehicle when the
spring brakes have been manually re-
leased. Driving a vehicle after its
spring brakes are manually released is
extremely dangerous. The brakes may
not function. Failure to comply may re-
sult in death, personal injury, equip-
ment or property damage.
WARNING
DO NOT disassemble a spring brake
chamber. These chambers contain a
powerful spring that is compressed.
Sudden release of this spring may re-
sult in death or personal injury.
EMERGENCY - How to Recover a Vehicle
Copies of these can be obtained from the
following address: Technology &
Maintenance Council 950 N. Glebe Road
[phone] Arlington, VA 22203
Email:
Y53-6113-1A1 (11/20)
37
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