Goose, I did look it up. I can't find squat about PM of the air drier / desiccant renewal in the shop manual. There are schematics and instructions on how to remove and replace the drier from the air supply unit (it's built into it of course, along with compressor, valves, etc.), but no mention anywhere of how often it should be serviced. My guess is: not until it's broke. :wink:
Thanks again Umberto for the excellent info the whole system!!
I'm guessing the dessicant volume is sized so that even as regeneration efficiency declines over time, it probably lasts as long as the compressor is designed to. Even these regenerative dessicants are changed out every few years on the commercial systems, but there its more critical that the brakes always work when you press the pedal ...that's why I was curious.
Who knows? All I know is water+compressor=bad, esp in winter. But if LR says not to change it I won't.
1. WARNING: Do not work on or under a vehicle supported only by a jack. Always support the vehicle on safety stands. Raise and support the vehicle.
2. Remove the air suspension compressor.
3. CAUTION: Before disconnecting or removing the components, ensure the area around the joint faces and connections are clean and dry. Plug open connections to prevent contamination. Disconnect the air line from the air suspension compressor drier.
o Release the air line from the retaining clip.
4. NOTE: If equipped, note the position of the air suspension compressor retaining cable. Remove the air suspension compressor drier.
o Remove the retaining screw.
o Remove and discard the O-ring seal.
1. Install a new O-ring seal.
o Lubricate the O-ring with a lithium based grease.
2. NOTE: If equipped, make sure the air suspension compressor retaining cable is correctly routed around the compressor cylinder head. Install the air suspension compressor drier.
o Install the retaining screw and tighten to 3 Nm (2.2 ft. lbs.) .
3. CAUTION: Visually inspect the air line ends for damage or wear. Replace the air line as necessary. CAUTION: Pull on the air line to make sure it is securely installed in the connector. Connect the air line to the air suspension compressor drier.