Automatic Slack Adjuster - Gunite Type 1-1/2in x 10 Spline, 5-1/2in Arm with Clevis Kit - Replaces Gunite AS1032 Mack 25QD51P2 138.1011

Keep the brakes in adjustment on their own with this Gunite Type Automatic Slack Adjuster distributed by FleetPro Parts & Tires. Built by Automann for Eaton and Meritor applications, it converts brake chamber pushrod stroke into S-cam rotation and self-adjusts brake shoe clearance as the linings wear. Worn or seized slack adjusters cause long pushrod stroke and out-of-adjustment brakes, a top CSA violation and the kind of write-up that parks a truck instead of just costing points. We stock these heavily right here in our Hanover Park, Illinois warehouse to ensure lightning-fast shipping for fleets, diesel repair shops, and owner-operators nationwide.

Adjustment Handled: The Gunite Type Slack Adjuster Advantage

This is the Gunite type unit with a 1-1/2in x 10 spline bore and a 5-1/2in arm, and it ships with 1- 179.YK5010 Clevis Kit so the clevis and pin come in the box rather than being scavenged off the old adjuster. Reusing a worn clevis is a false economy: the elongated pin hole adds lost motion to every stroke and hands back the adjustment accuracy you just paid for.

Because it self-adjusts, this unit takes up shoe clearance continuously as the linings wear, so pushrod stroke stays inside spec between services instead of creeping long and quietly stealing brake torque. Replace slack adjusters in axle pairs — both wheel ends need to stroke the same distance at the same pressure, or the axle brakes unevenly and one lining pays for it.

At FleetPro Parts & Tires, we know that brakes are where a repair either holds up or does not. This Automann unit is a direct replacement for highly searched industry numbers including Gunite AS1032, AS1132 and AS1146, Euclid E15016 and Mack 25QD51P2.

Vehicle Fitment & Compatibility

This heavy-duty aftermarket slack adjuster is intended for the following commercial applications:

• Make/Model: Eaton and Meritor applications
• Type: Gunite type automatic slack adjuster
• Spline: 1-1/2in x 10 spline
• Arm Length: 5-1/2in
• Component Group: Air Brake Foundation / Slack Adjusters

Direct Replacement & Cross-Reference Numbers:

This Automann slack adjuster serves as a direct replacement for the following part numbers:

• Euclid Interchange: E15016
• Gunite Interchange: AS1032, AS1132, AS1146
• Mack Interchange: 25QD51P2
• Automann Distributor #: 138.1011

Technical Specifications

• Component Type: Automatic Brake Slack Adjuster
• Type: Automatic, Gunite type
• Spline: 1-1/2in x 10 spline
• Arm: 5-1/2in
• Includes: 1- 179.YK5010 Clevis Kit
• Application: Eaton, Meritor
• Weight: 7.3 lbs
• Package Dims: 11.25 x 5.875 x 2.75 in
• Product Level: Fleet Standard Aftermarket
• Brand: Automann (Distributed by FleetPro Parts & Tires)