The Midland kit is perfect for an Air Brake Dryer rebuild. Although this is a complete kit, you should probably try a smaller filter between a full rebuild. It's cheaper and does the job. I check the air dryer every 12,000 but I live and ride in a dry climate. If you live in a humid area, it's best to check the small filter every 6,000 miles and change it every 24,000 miles.
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