Product Description
FP400-10144 - AUTO SLACK ADJUSTER - 28 SPLINE, 1 1/2" - 6"
PART NUMBER(S):
Fleet Products: FP400-10144 | OE: 400-10144, A41-3275-Z-1144, 10-400-10144 | Automann: 133.2832, 135.2832
DESCRIPTION:
Model: Automatic Slack Adjuster
Vehicles: Compatible with drum brake-equipped heavy-duty vehicles, including Freightliner, Mack, Volvo, and trailer axles
• Spline Size: 28 teeth
• Camshaft Diameter: 1 1/2"
• Arm Length: 6" (center-to-center)
• Arm Hole Diameter: 1/2"
• Mounting Style: Clamp-style anchor (straight arm)
• Mounting Hole Center: 6"
• Mount Offset: 0°
• Body Angle: 180°
• Brake Type: Drum brake
• Clevis Compatibility: Fits all major clevis types
• Piston Color: Yellow piston (per OE documentation)
• Material: Heat-treated forged steel
• Lubrication: Factory sealed with zerk fitting port (if required)
• System Technology:
• Automatic (self-adjusting)
• Built-in installation indicator
• Factory-sealed worm wheel
• Long-stroke compatible
• O-rings/gaskets for contamination protection
• Performance:
• Designed for long service life
• On-highway durability rating up to 1,000,000 miles or 6 years
Applications:
Engineered for use in drive and trailer axle drum brake systems requiring a 28-spline, 1 1/2" cam, and 6" straight arm auto slack adjuster. Direct replacement for several OE and aftermarket variants across Freightliner, Mack, Meritor, Midland, and Haldex platforms. Ideal for fleets seeking high-durability self-adjusting brake control components.
CROSS-REFERENCE(S):
40010144, 070-40010144, HDX40010144, 40910678, ZSA40010144, 50420, SA10144, 409-10678, 10-400-10144, 1040010144, 808113, 808149, 815792, 815811, 973649, E-6918, E6918, E-6918A, E6918A, OTR10144, GTA-40010144, GTA40010144, AS1041, AS1141, 409-10070, 40910070, 409-10167, 40910167, 409-10288, 40910288, 409-10443, 40910443, 409-10505, 40910505, 409-10579, 40910579, 500-10144, 509-10070, 50910070, 509-10443, 50910443, 509-10579, 50910579, 509-10678, 5090678, KSA10144, 25QD259P7, 25QD340P6, 25QD412, 25QD49, 5396-40010144, M807016, R806016, R806016A, WA10144, PL-10144, PL101144, RB-10144, RB10144, 767653143408, VTC-38532, A86016, M-4056, WBA07130A, MIR40010144, MIR-400-10144, S23853, 400-10144C8T, MPGS-23853, ATX23853, 400-10144-RC, ATP23853, 23853SS, VIP400-10144, 400-10144HTP, GTS23853, PS400-10144, TF400-10144, HSA5042, HSA50420, EM50420, PROSA56144, PROSA56144, AM1332832, 8235R806016A, MID40010144, HA40010144, HDV10144, 0000-HDV10144, 05-659, 1044P, L3608, R806016, M807016, 8235M807016, TDAM807016, TDAR806016A
A cross-reference listing means this part may be a compatible replacement for these part numbers based on OEM or distributor data.
IMPORTANT INSTALLATION NOTES:
✔ Always install per OEM and manufacturer documentation
✔ Use proper torque specs during installation
✔ Ensure 6" straight arm orientation and accessible zerk fitting
✔ Verify spline and camshaft fit before securing clamp mount
✔ Lubricate if required—some models are permanently sealed
✔ Check installation indicator and brake stroke upon setup
✔ Use correct clevis pin and ensure full adjuster return after brake application
✔ Periodic inspection recommended to ensure continued functionality
SOLD AS NEW
Brand new and ready to install, with OEM Grade Reliability
SUPPORT & ORDERING
For technical support, installation guidance, or to confirm fitment, Call: 1-877-243-0442 | Email: sales@fleet-products.com
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