BENDIX® AD-IP® AIR DRYER TROUBLESHOOTING CHART
SYMPTOMS | CAUSE | REMEDY |
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1. Air dryer is constantly | A. Excessive system leakage. | A. If leakage IS SHOWN on the gauges, test for | ||
“cycling” or purging. | IMPORTANT: Note whether | excessive service brake system leakage. | ||
Air dryer purges | air pressure loss is shown | Allowable leakage: | ||
frequently (every four | on dash gauge(s). Pressure | Single vehicle - 1 psi/minute either service reservoir. | ||
(4) minutes or less | loss SHOWN on gauges | |||
Tractor trailer - 3 psi/minute either service reservoir. | ||||
while vehicle is idling). | is caused by service brake | |||
| system or component | Repair and retest as required. | ||
| leakage. Pressure loss |
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| NOT SHOWN on gauges is |
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| caused by supply system or |
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| component leakage. |
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| Dash |
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| Gauge | Air pressure loss shown on | |
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| the dash gauges: test all | |
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| components, fittings and lines | |
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| Dash | in the service brake system | |
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| (from this point downstream). | ||
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| Gauge |
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| B. If leakage is NOT SHOWN on gauges test for | ||
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| excessive supply system leakage. | ||
Remove the drain cock, or valve, in the supply reservoir (wet tank) and install an air gauge. Build the system pressure and allow the air dryer to purge. Observe the air gauge in the supply reservoir. The pressure drop should not exceed 1 psi per minute.
Perform tests 1 to 6 in the order presented.
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