Problem | Action |
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The air brake dryer desiccant cartridge requires replacement. | Replace the desiccant cartridge. |
The air system was charged from an external air source. Air is not passing through the air brake dryer. | Decrease use of the inflation valve in order to charge the system. |
The air brake dryer is not purging. | |
The air brake dryer is not functioning. | Repair or replace as necessary. |
The purge (air exhaust) time is too short because of excessive system leakage. | Refer to Desiccant Being Expelled From Purge Valve Exhaust . |
The piston rings are worn out. | Overhaul or replace the air compressor. |
The air filter is dirty. | Replace the air filter. |
The inlet vacuum is high. | Clean or repair as needed. |
The air compressor oil outlet hose is restricted. | Remove the restriction or replace the air compressor oil outlet hose. |
The engine oil pressure is too high. |
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The air compressor oil inlet hose is flooded with water. |
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The air compressor oil outlet hose is flooded with water (gasoline engine). |
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The air compressor oil outlet return passage is flooded with water (diesel engine). |
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The piston rings are not properly seated. | Overhaul or replace the air compressor. |
The back pressure exists from the engine crankcase. | Determine the cause of the back pressure and repair. |