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What can you check that the spring brakes come on automatically?
Wiki User
∙ 13y ago
-choke the wheels, release the parking brakes. when you have enough air pressure to do it, and shut the engine off.
-step on/off the brake pedal to reduce to airtank pressure
-the parking knob should pop out when the air pressure falls to the manufacturers specification (usually 20-40 psi)
THIS CAUSES THE SPRING BRAKES TO COM ON.
To check for emergency operation of spring brake on straight truck:
Release park brake.
Build air pressure to 100 psi. & shut engine off.
Drain primary air tank & step on brake foot pedal.
You should hear air exhaust from brake chambers & rear brakes should apply.
This will give you controlled spring brake application if you loose primary air pressure.
Wiki User
∙ 13y ago
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