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Presentation of the Air Brake Test on a 2011 IC Conventional Style School Bus (Pre-Trip Inspection), using the acronym "SALSSP", in Richmond Hill, Georgia.
S: Safe Start
A: Air Leak Test (static and applied service brake)
L: Low Air Pressure Warning Test
S: Spring Brake
S: Service Brake
P: Parking Brake
The air brake is applied, when the yellow diamond button is pulled. It is released when the same button is pushed.
** At approximately 120 psi, the airdryer pops. It sends bursts of air back to governor to stop the compressor from pumping air. **
** The wheels of the vehicle must be chocked to perform the air brake test. **
For more details, refer to your state's Department of Motor Vehicles-issued Commercial Driver's License Manual.