The Midland Haldex Automatic Brake Adjuster (S-ABA) Kit, part number 40020227, is a complete slack adjuster kit designed for truck and trailer S-cam drum brake systems. It features a 1-1/2" spline diameter with a 28-spline count, a 5-1/2" arm length, 0° body angle, and zero offset. The 1/2" arm hole diameter works with the included strap-style anchor bracket (bracket kit 42710543). The straight grease fitting is positioned at 180°. High-alloy steel gears, a rolled wormshaft, and a heat-treated housing are built into the adjuster. The clearance-sensing design maintains a consistent drum-to-lining distance, and its gradual adjustment reduces the risk of over-adjustment during extended braking events. OEM reference: 409-26003. Also sold under part numbers MD40020227 and HDX40020227. Call us to confirm proper fit for your application.
Features
S-ABA (Automatic Brake Adjuster) kit for truck and trailer S-cam drum brake systems
1-1/2" spline diameter, 28-spline count
5-1/2" arm length, 0° body angle, zero offset
Strap-style anchor bracket included (bracket kit 42710543)
Straight grease fitting at 180° location
High-alloy steel gears, rolled wormshaft, and heat-treated housing
Tech Specs
- Spline Diameter: 1-1/2"
- Spline Count: 28
- Arm Length: 5-1/2"
- Body Angle: 0°
- Offset: 0
- Arm Hole Diameter: 1/2"
- Anchor Bracket Style: Strap
- Bracket Kit: 42710543
- Grease Fitting Type: Straight
- Grease Fitting Location: 180°
- OEM Part Number: 409-26003
