How to Identify a Manual Slack Adjuster

If you've ever sold heavy-duty truck parts, you know how difficult it can be to identify a specific slack adjuster without a part number. But thanks to a new mobile app, you can easily identify the exact part that you're looking for. With the Diesel Parts app, you can quickly identify slack adjusters by part number and even VIN.
First, determine the length of the slack adjuster's arm. Use a measuring tape to measure the distance between the center of the big gear on the bottom of the arm and the small pin at the end. The arm length will likely fall somewhere between 5" and 6-1/2 inches.
Automatic slack adjusters are now available on many newer trucks, but they aren't as co
mmon on older vehicles. Most older straight trucks and trailers, for example, still have manual slack adjusters. But that doesn't mean they're obsolete. In fact, more than 30% of older straight trucks have manual slack adjusters.
A manual slack adjuster can reach its adjustment limit quickly. If the slack adjuster were manually adjusted, the brakes might wear out prematurely. That would lead to more problems and accidents. Manually adjusting slack adjusters are often not adjusted on a set interval. But they do need periodic adjustments.
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