Description
FP1138 - AUTO SLACK ADJUSTER - 24 SPLINE - 1 1/4" - 5 1/2" (STEER AXLE)
PART NUMBER(S):
Fleet Products: FP1138 | OE: A14-3275-Z-1144 | Automann: 136.241, 138.2410
DESCRIPTION:
Model: Automatic Slack Adjuster
Vehicles: Steer axle drum brake systems (e.g., Freightliner, Volvo, Mack)
• Spline Size: 1 1/4", 24 teeth
• Arm Length: 5.5" center-to-center (fixed)
• Mount Type: Straight arm (0° body angle, no offset)
• Clevis Type: Collar lock, straight with 1/2-20 UNF-2B thread
• Brake Chamber Compatibility: Type 16 (T-16)
• Brake Type: Drum Brake (15")
• Material: Forged alloy steel for high tensile and fatigue strength
• Adjustment Mechanism: Clearance-sensing automatic (self-adjusting)
• Lubrication: Zerk fitting (manual grease)
• Mounting Hole Center Distance: 5.5"
• Piston Color: Yellow (per Meritor specs for A14-3275-Z-1144)
• Max Torque Rating: <15 ft-lbs
• Vehicle Axle Position: Steer axle only
Applications:
Used in heavy-duty commercial steer axle drum brake systems where a 24-spline, 1 1/4" camshaft and a 5.5" straight arm are required. Designed for long-life performance, quick installation, and consistent brake adjustment in Freightliner, Volvo, Mack, and other Class 8 vehicle applications. Suitable for replacement of A14-3275-Z-1144 and equivalent references in OE and aftermarket systems.
CROSS-REFERENCE(S):
A113275H1152, AS1038, AS1138, CS56038, A253275N768S, A353275N768, TDAR801003, RWR801003, R801003, AS-1138, AS1007, AS1011, BHS-C300, CB25100, CB25102, CB35100, E11397, E172, 05-472, E224, E319, E364, M3365, GURAS1138, GUR-AS-1138, S-C300, AS-1138C8T, MPGS-C300, ATXC300, AS-1138-RC, GTPAS-1138, ATPC300, C300SS, VIPAS-1138, AS-1138HTP, GTSC300, PSAS-1138, TFAS-1138, 25-QD-261, E6989, E15022, CS62335, CB25100, CB25102, CB35100, CS-52335, CS-56014, KN-52270, 1091671, 1092020, 3948970, 8060852, 85100219, 681-410-0849, 681-420-0849, 76401-0149, 76401-3469, 5037, RF840013018, GUNAS1038, GUN AS1138, GUR-AS-1138, M3365, SC300, ZBRAS1038, 5772, 40010072, 40010073, R802062, F225066, 3398AS1038, E-15022, 65167A 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 instructions to ensure proper brake function and safety
✔ Use only compatible clevis and 1/2" pin sizes
✔ Ensure straight arm installation with zerk fitting accessible for maintenance
✔ Torque per OEM specifications; verify brake stroke and initial setup
✔ Grease if model requires manual lubrication—some are permanently sealed
✔ Check periodically for wear, corrosion, or binding
✔ Replace immediately if automatic adjustment fails or arm shows signs of fatigue
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