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-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.

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14y ago

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