The Midland Haldex S-ABA automatic brake adjuster, part number 40020240, is a clearance-sensing slack adjuster designed to maintain a constant, uniform gap between the brake drum and lining. Spec highlights include a 1-1/2" spline diameter with 28-spline count, a 5-1/2" arm length, 34° body angle, zero offset, and a 5/8" arm hole diameter. The straight grease fitting is positioned at 180°. High-alloy steel gears, a rolled wormshaft, and a heat-treated housing contribute to durability, while the centralized clutch design reduces the risk of over-adjustment during extended braking events. Corresponding bracket kit is 42710553K (strap-style anchor bracket). OEM cross-reference: 409-26046. Also cross-references MD40020240, HDX40020240, and MID40020240. Call us to confirm proper fit for your application.
Features
1-1/2" spline diameter, 28-spline count
5-1/2" arm length, zero offset, 5/8" arm hole diameter
34° body angle
Straight grease fitting at 180° position
High-alloy steel gears with rolled wormshaft and heat-treated housing
Centralized clutch reduces over-adjustment risk during prolonged braking
Tech Specs
- Spline Diameter: 1-1/2"
- Spline Count: 28
- Arm Length: 5-1/2"
- Body Angle: 34°
- Offset: 0
- Arm Hole Diameter: 5/8"
- Grease Fitting Location: 180°
- Grease Fitting Type: Straight
- Anchor Bracket Style: Strap
- Bracket Kit: 42710553K
- OEM Part Number: 409-26046
