PART 7: STARTING & OPERATING THE VEHICLE BRAKE SAFETY AND EMERGENCY
(05/10) Y53-6032 – 121 –
Manually Releasing Spring Brakes
There may be an occasion when you need to tow the vehi-
cle but the air system does not produce enough operating
pressure to release the parking brakes. For these situa-
tions, the spring brakes may be manually released to
allow the vehicle to be towed. This section details how to
release a drum or an air disc brake.
WARNING!
• Do not operate a vehicle when the spring
brakes have been released manually. Driv-
ing a vehicle that has had its spring brakes
manually released is extremely dangerous.
You would probably have no brakes at all,
which could cause death or serious injury.
• Releasing the spring brakes on an unse-
cured vehicle could lead to an accident. The
truck could roll, causing death or severe
injury. Always secure the truck with wheel
chocks, chains, or other safe means to pre-
vent rolling before manually releasing the
spring brakes.
• Disassembling the spring brake chamber is
dangerous and could cause death or seri-
ous injury. These chambers contain a pow-
erful spring that is compressed. Sudden
release of this spring could cause you to be
badly injured. Do not disassemble a spring
brake chamber.
NOTE: The primary purpose of the manual
release feature is to permit the vehicle to be
towed to a repair facility.
Y53-6032.book Page 121 Monday, May 24, 2010 3:37 PM
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