Best Heavy Duty Vehicle Brake Slack Adjusters in 2026

Tool used on Knorr Bremse Calipers type SB SK SN typically found for Volvo Peterbilt DAF Foden MAN Mercedes Scania BOVA plus BPW SAF Trailers.

113826 OEM Replacement 11point x 3/8 D 26 mm long.

Our brake caliper socket replaces the original which was manufactured from Chrome Vanadium

SLACK ADJUSTER TOOL AUTOMATIC

Meritor Type Automatic Slack Adjusters

Includes Release Tool and Wrench

Fork-end designed tool able to fit securely under the pull pawl, allowing hands-free operation

5/16 offset square reversible wrench with E-Z Grip handle for adjusting the brake, and capable

Truck air brake adjusting wrench set

SLACK ADJUSTER TOOLS: Our slack adjuster tool set is designed to aid in the installation and servicing of Meritor-brand air braking systems on heavy-duty trucks, long-haul trucks, and trailers; Brake adjustment tool simplifies brake service

CONVENIENT FEATURES: The slack adjuster wrench tool comes with a 5/16 inch double-square head and a built-in offset ratcheting mechanism that provides extra clearance for hands and knuckles; Ratcheting brake tool speeds up installation and service

EASY TO USE: This Meritor slack adjuster features a side-mounted forward and reverse lever, allowing for quick direction changes without removing the brake adjuster tool from the slack adjuster; Convenient hand tools for any mechanic tool set

Function: Safely replace brake shoes on heavy-duty tractors and trailers

Hook Design: This tool has a little hook that engages the spring at the J eye on the end, and the bar goes under the axle to leverage the spring out of position

Easy to Use: Simply hook the retaining spring loop and press down against the axle.

Constructed of 20-gauge sheet metal with red, yellow, and green durable powder coat riveted together.

The set is divided into 3 separate colors: red, yellow & green; these identify if the brakes are still good (Green), should be serviced (Yellow), or are past due and must be serviced (Red).

Each gauge blade has both Metric & SAE: 3 green (12, 10, 8 mm), 3 yellow (6, 5, 4 mm), and 2 red (3, 2 mm).

INCLUDES: This slack adjuster release tool set includes two different tools to quickly and easily adjust slack adjusters on trucks and trailers equipped with air brake systems. The fork end release tool releases the tensioner button, and the 5/16-inch double square reversible ratcheting wrench adjusts the brake system.

DESIGN: These tools are made of durable carbon steel and feature oversized double injection handles, designed to offer increased comfort, grip, and leverage for an easier service job from start to finish. The double square ratcheting wrench provides reversible ratcheting action with an angled head for easier clearance and access.

APPLICATIONS: This set’s fork end tool fits securely under the brake system’s pull pawl, allowing for hands-free operation perfect for owner-operators looking to service their own trucks. These tools hold the system’s tensioner release system and adjust the brakes safely, avoiding damage caused by other tools’ excessive prying force.

cutoolcar Automatic Slack Adjuster Release Tool Wrench Set is used to speed up installation and service on truck air brake systems, such as heavy-duty trucks, long-haul trucks, and trailers. Make the job of brake service easier.

Easy to Use: The fork-end release tool fits securely under the brake system’s pull pawl, allowing hands-free operation for servicing your truck. The tool is designed to release the tensioner button and adjust the brakes safely without prying or damaging.

Convenient for any mechanic tool set: The 5/16" double square ratcheting wrench with E-Z Grip handle for adjusting the brake. Easy to operate, features a side-mounted forward / reverse lever.

Genuine OEM Haldex Part

OEM Automatic Slack Adjuster Kit

Part Number: 40010141

FITS: For install and remove all truck brake springs. Universal fit for all eaton air brake shoe anchor springs, models：LT895.

ADVANTAGE: The grooved end on the tool always keeps the spring at the correct working angle. So you can easily connect the spring.this makes it easier to remove or install the spring.

MATERIAL: Made of high-quality steel, with high hardness, good corrosion resistance and rust resistance, and long service time.

Built in Ratcheting Mechanism: our automatic slack adjuster wrench is featured with a deep reaching 7/16 inch hex head which can touch the locations of the air brake system adjustment with full 360 degree rotational swing for ease of any angle's operation

Hand Free Design: the brake adjuster wrench is fixed on the brake nut, the extended length rubber handle (approx. 8") provides your hand increased comfort and adds more leverage while overcoming the anti reverse mechanism; Also, the vinyl grip is more slip resistant and protects ratchet head

Quality Materials: the slack adjuster tool is made of stable carbon steel and the two side is featured with oversized double injection rubber; Solid carbon steel makes our slack adjuster more sturdy to work and rubber packaged the side provides increased comfort, grip, and leverage for an easier service job for workers