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METRO Air Brake Test

Air Brake Verbal Test

QuestionAnswer
WHY: This test is verify the air governor stops building air pressure AT A MAXIMUM OF 140 PSI Air Governor Cut-Out
1. With the parking brake applied, transmission in neutral, start engine. (SAFE START) Air Governor Cut-Out
2. Building air pressure using 1/3 throttle or fast idle, needle should move to the right and stop. Air Governor Cut-Out
3. IDENTIFY AT WHAT PSI THE NEEDLE CUTS-OUT. (Needle stopped moving) Air Governor Cut-Out
NOTE: If bus is already running, lower air pressure to 90 PSI, then build air pressure to air governor cut-out Air Governor Cut-Out
WHY: This test is to verify the air governor starts building air pressure AT A MINIMUM OF 85 PSI. Air Governor Cut-In
1. With air governor at cut-out, apply brake pedal one time (pause 5 to 10 seconds between PUMPS) Air Governor Cut-In
2. Watch for needle to start moving to the right. Air Governor Cut-In
3. IDENTIFY AT WHAT PSI THE NEEDLE CUTS-IN. (Needle starts moving) Air Governor Cut-In
NOTE: If the needle does not move to the right, apply brake pedal again, and repeat process if necessary. Air compressor must Cut-In no lower than 85 PSI Minimum. Air Governor Cut-In
WHY: This test is to verify the air pressure builds from 85 PSI to 100 PSI within 45 seconds. Air Pressure Build Up
1. Lower air pressure to 85 PSI by applying the service brake. Air Pressure Build Up
2. IDENTIFY THE AIR PRESSURE BUILDS FROM 85 PSI to 100 PSI within 45 Seconds Air Pressure Build Up
NOTE: Acceleration will not be used for this test Air Pressure Build Up
WHY: This test is to verify the brake system has no air leaks, must be at Cut- Out (IDENTIFY CUT-OUT) Applied Air Leakage
1. Fully Charge the system, identify where needle cut-out occurs(stopped). Applied Air Leakage
2. Turn engine off, electrical power on, firmly apply pressure to service brake. Applied Air Leakage
3. Release parking brake wait for needle to stop moving and stabilize before timed. Applied Air Leakage
4. Air loss should not exceed more than 3 PSI in 1 Minute, IDENTIFY ANY AIR LOSS. Applied Air Leakage
NOTE: Master switch stays in DAY RUN position, electrical power on, engine off to complete Air Leak, Low Air & spring Brake Test Applied Air Leakage
WHY: This test is to verify the brake system has no air leaks Static Air Leakage
WHY NOT: This test is performed on LEVEL ground only or with WHEEL CHOCKS Static Air Leakage
1. To perform this test, the air pressure should be at normal operating range. Static Air Leakage
2. Turn engine off, electrical power on, cover service brake without foot pressure. Static Air Leakage
3. Verify parking brake is released, wait for needle to stabilize before timed. Static Air Leakage
4. Air loss should not exceed more than 2 PSI in 1 Minute, IDENTIFY ANY AIR LOSS. Static Air Leakage
WHY: This test is to verify the low air warning light and/or audible alarm will activate. Low Pressure Warning Signal
1. Verify parking brake is released, engine off, electrical power on.* Low Pressure Warning Signal
2. Pump service brake to lower air pressure* Low Pressure Warning Signal
3. Low air pressure warning signal should activate no lower than 55 PSI. Low Pressure Warning Signal
4. MUST identify when low air pressure warning activates and mention no lower than 55 PSI. Low Pressure Warning Signal
WHY: This test is to verify emergency/Spring brake will pop in the event of an air leak. Emergency Spring Brake
1. Verify parking brake is released, engine off, electrical power on.** Emergency Spring Brake
2. Pump service brake to lower air pressure.** Emergency Spring Brake
3. Spring brake should pop up at approximately 40 PSI(IDENTIFY where pop up occurs) Emergency Spring Brake
WHY: The test is to verify the rear door interlock is functioning properly Rear Door Interlock
1. With the engine running, build air pressure to cut-out Rear Door Interlock
2. Apply service brake, place gearshift in drive, open rear door, release parking brake, slowly release service brake and apply pressure to the accelerator. Rear Door Interlock
3. The bus should not move or accelerate. Rear Door Interlock
WHY: This test is verify the parking brake will prevent the bus from moving while in gear. Parking Brake
1. System at normal operating range, apply service brake, activate parking brake, close rear door. Parking Brake
2.Verify transmission is in drive, apply slight acceleration, engine should accelerate. Parking Brake
3.IDENTIFY BUS DOES NOT MOVE. Parking Brake
WHY: This test is to verify the service brake works properly. Must demonstrate safely. Service Brake
1. System at normal operating range, apply service brake. Service Brake
2. Verify Transmission is in drive, release parking brake, drive forward no more than 5 MPH. Service Brake
3. Apply a normal application of the service brake, bus should stop and not pull left or right. Service Brake
NOTE: Document any unusual feel or delayed stopping action. Service Brake
Created by: Justimo
 

 



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