40020234 Midland Haldex S-ABA Automatic Slack Adjuster

The Midland Haldex 40020234 is an S-ABA (automatic brake adjuster) designed for standard drive axle applications. It features a 1-1/2" spline diameter with a 28-spline count, a 6" arm length, and a 34° body angle with zero offset. The arm hole diameter is 1/2". The 45° grease fitting is positioned at 180° for straightforward service access. Internal construction includes high-alloy steel gears, a rolled wormshaft, and a heat-treated housing with a centralized clutch. The clearance-sensing design maintains consistent drum-to-lining distance and reduces the risk of over-adjustment during prolonged braking. Bracket kit 42710553 (strap-style anchor bracket) is sold separately. OEM cross-reference: 409-26023. Call us to confirm proper fit for your specific axle and brake configuration.

Features

S-ABA automatic slack adjuster for standard drive axle applications
1-1/2" spline diameter, 28-spline count
6" arm length, 34° body angle, zero offset
45° grease fitting located at 180° for easy lubrication access
High-alloy steel gears with rolled wormshaft and heat-treated housing
Centralized clutch design reduces over-adjustment risk during prolonged braking

Tech Specs

• Spline Diameter: 1-1/2"
• Spline Count: 28
• Arm Length: 6"
• Body Angle: 34°
• Offset: 0
• Arm Hole Diameter: 1/2"
• Grease Fitting Location: 180°
• Grease Fitting Type: 45°
• Anchor Bracket Style: Strap
• Bracket Kit: 42710553
• OEM Part Number: 409-26023

Additional Information

The clearance-sensing design maintains a constant and uniform distance between the brake drum and lining.
The gradual adjustment of the S-ABA lowers the risk of over-adjustment during prolonged braking.
For standard drive axle applications.
Cross-references include: 21691670, 3518990, 40020234M1D, 40920023, SA2175, SIRSA2175, HDX40020234, MD40020234, MID40020234, M808029.