PART 7: STARTING & OPERATING THE VEHICLE BRAKE SAFETY AND EMERGENCY
(R10/06) Y53-6007 – 101 –
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.
You could have a serious or fatal accident.
• Releasing the spring brakes on an unse-
cured vehicle could lead to an accident. The
truck could roll, causing severe injury.
Always secure the truck with wheel chocks,
chains, or other safe means to prevent roll
-
ing before manually releasing the spring
brakes.
• Disassembling the spring brake chamber is
dangerous and could cause serious injury.
These chambers contain a powerful spring
that is compressed. Sudden release of this
spring could cause you to be badly injured.
Do not disassemble a spring brake cham
-
ber.
NOTE: The primary purpose of the manual
release feature is to permit the vehicle to be
towed to a repair facility.
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