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Air Brake Test

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Air Brake Test

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Test Parking Brake
Test Low Pressure Warning Signal
Check Rate of Air Pressure Buildup
Check that the Spring Brakes Come on Automatically
Test Service Brakes
Test Air Leakage Rate
Check Air Compressor Governor Cut-In and Cut-Out Pressures

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A) Test Air Leakage Rate:

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Turn Off Engine
After initial pressure drop, a pass is equal to the air pressure loss less than 3 PSI per minute
Attain fully-charged air system (typically 125 PSI)
Time Air Pressure Drop for 1 minute
Release the Service Brake
Apply brake pedal with 90 PSI or more for 60 seconds
Pass= Loss Rate less than 2 PSI per minute

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B) Test Low Pressure Warning Signal

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Step ON and OFF the brake pedal to reduce air tank pressure.
Turn the electrical power on.
The low air pressure warning signal must come ON before the pressure drops to less than 60 PSI in the air tank with the lowest air pressure
Shut the engine off when the low pressure warning signal is not on.

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C) Check that the Spring Brakes Come On automatically

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Step ON and OFF the brake pedal to reduce air tank pressure
"PARKING BRAKE" Knob should POP OUT when air pressure falls in range between 20-40 PSI, causing Spring Brakes to Come ON
Chock the wheels
Shut the Engine Off
Release the Parking Brake when there is enough air pressure to do it

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D) Check Rate of Air Pressure Buildup

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When the engine is operating between 600-900 RPM, the pressure should build from 85-100 PSI within 45 seconds in dual air systems

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E) Check air compressor governor CUT-IN and CUT-OUT Pressures

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Run the engine at fast idle.
Pumping by the air compressor should start at about 100 PSI and stop at about 125 PSI
With the engine idling, step on and off the brake to reduce the air tank pressure. The compressor should CUT-IN at about the manufacturer's specified CUT-IN pressure. The pressure should begin to rise.
The air governor should CUT-OUT the air compressor at about the manufacturer's specified pressure. The air pressure shown by your guage(s) will stop rising.

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F) Test Parking Brake

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Gently attempt to drive forward against it in a low gear to test that the parking brake will hold
Put the PARKING BRAKE ON.
Stop the Vehicle.

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G) Test Service Brakes

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Move the vehicle forward slowly (about 5 MPH)
Wait for normal air pressure
Apply the brakes firmly using the brake pedal
Release the parking brake.
Note any vehicle "pulling" to one side, unusual feel, or delayed stopping action.

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