World American WA10142 Auto Slack Adjuster 10 Spline 1.5 Inch Bore 5.0–6.0 Inch Arm Replaces Haldex 10142 Automann 133.103 Meritor R806023 Volvo 3946523

Short Summary: World American is the Heavy Duty and Export Division of Midwest Truck & Auto Parts, Inc. We supply drivetrain, brake, steering, electrical and hydraulic components to the heavy, duty aftermarkets. Specifically, we distribute Manual Transmission & Transfer Case Components, Differential Components, complete Rebuild Kits, Bearing Kits, Ring & Pinion Gear Sets, Cases, Housings, Axles, Yokes, U-Joints, Air Brake Valves, Brake Chambers Brake Hardware Kits, Air Springs and more.Key FeaturesAdjuster Type: Automatic Slack AdjusterSpline Count: 10 SplineSplined Bore Diameter: 1.5 InchesArm Length Range: 5.0–6.0 InchesBrake System: S-Cam Air Brake SystemsApplication: Heavy-Duty Trucks, Tractors, and TrailersApplications Designed for commercial vehicles requiring reliable automatic brake adjustment, this slack adjuster supports proper brake stroke, reduces manual adjustment needs, and helps maintain compliance with safety regulations across highway and vocational fleets. Replaces OEM & Aftermarket Part NumbersHaldex: 10142, 400-10142, 40020233, MID40010142Automann: 133.103, 133.1030, 135.1030Meritor: M80723, R806023, R806023AVolvo: 3946523, 3946757Mack: 25-QD-410-P2Euclid: E-6923BFreightliner: HDX 40010142, HDX 40020233Quality & Reliability Manufactured to meet demanding commercial vehicle standards, World American slack adjusters are built for durability, precise operation, and dependable braking performance in real-world fleet conditions.

• Automatic slack adjuster engineered for heavy-duty air brake systems, featuring a 10-spline configuration with a 1.5 inch splined bore diameter, ensuring precise camshaft engagement and consistent brake adjustment for on-highway truck and trailer applications.
• Adjustable arm length design from 5.0 to 6.0 inches, allowing proper brake geometry setup across multiple axle configurations, improving braking efficiency, reducing uneven shoe wear, and maintaining correct pushrod stroke automatically during service.
• Heavy-duty construction for commercial vehicle use, built to withstand demanding road conditions, vibration, and frequent brake cycles while maintaining accurate automatic adjustment to help extend brake component life and reduce manual maintenance.
• Direct replacement automatic slack adjuster, compatible with a wide range of OEM and aftermarket references including Haldex, Automann, Meritor, Volvo, Mack, Euclid, Freightliner, and Pro-Par for simplified cross-reference and installation.