When it comes to air filters, most replaceable filters for the engine air intake, or spin-on air filters for the air brake system, are likely to be on a regular maintenance list. But what about in-line air filters for the trailer air system?
Some trailer brake systems will have in-line filters designed to screen out debris headed toward the trailer ABS modulator and other valves. These valves are mounted in line with the air piping which more or less places them in and out of sight, out of mind position. That is until problems materialize anyway.
While not a regular service item, in-line filters do require periodic inspection. Your truck service information resource, like TruckSeries from Mitchell 1, will help you determine how often these filters should be inspected, as well as provide inspection and replacement procedures.