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The leading source for performance aftermarket truck & trailer chassis components.

Slack Adjusters


One of the most common safety hazards for heavy-duty trucks is when brakes fall out of adjustment. Slack adjusters prevent air brake systems from developing too much slack, ultimately keeping brakes functioning properly. For this reason, it’s essential to keep your slack adjusters in good repair.

Looking to replace your automatic slack adjusters? We offer a massive selection of aftermarket truck components – that match or exceed OE components in quality.

Automatic Slack Adjusters (ASA)

Our slack adjusters are compatible with ArvinMeritor, Bendix, Gunite, Haldex and Stemco air brake systems. Each ASA is sold with all the necessary accompanying parts, so they come ready to install. At FleetSpec, you’ll find slack adjusters that fit all makes and models of standard trucks and trailers.

Replacement Parts

If you don’t need to replace an entire slack adjuster but need to replace one of the component parts, we stock a wide range of parts and kits. We offer installation kits, pin kits and straight yoke kits. We also have small parts to fit slack adjusters of different sizes. If you aren’t sure what part you need, our team will help you figure it out.