*** Air Brake Test – School Bus – Class B CDL ***

Presentation of the Air Brake Test on a 2019 Conventional Style BlueBird Vision School Bus (Pre-Trip Inspection), using the acronym "SALSSP", in Richmond Hill, Georgia. S: Safe Start A: Air Leak Test 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. ** When air pressure reaches approximately 40 psi, the parking brake pops out like a spring. The parking brake is applied. ** ** Before air pressure reaches 55 psi, a lamp and a buzzer indicate that the air pressure has reached a level that is dangerously low. ** ** At approximately 120 psi, the airdryer pops. It sends bursts of air back to governor to stop the compressor from pumping air. ** The initial air pressure drop should be no more than 15 psi. The additional air pressure drop should be no more than 3 psi/min. ** 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.