Description
FP1138 - AUTO SLACK ADJUSTER - 24 SPLINE - 1 1/4" - 5 1/2" (STEER AXLE)
PART NUMBER(S):
Fleet Products: FP1138 (New) | Replaces OE: Automann 138.2410, 1382410 | Dayton 5772, 05772, 05-472 | Gunite AS1007, AS1011, AS1038, AS1138, AS1154, AS1155, SA03101, SA03401, SA04101, SA06802, SA06902, SA10102, SA11502, SAS1052, SAS1138, GUNAS1038, GUNAS1138, GUN AS1138, GURAS1138, GUR-AS-1138 | Euclid E-15022, E15022, E11397, E172, E224, E319, E364, E6989 | Haldex CS56038, 40010073, 40010072, CS62335, CS-52335, CS-56014, KN52240, KN52240X, KN-52270 | Meritor A2-3275-N1079, A13-3275M1079, A133275M1079, A23275N1079, A113275H1152, A253275N768S, A353275N768, TDAR801003, RWR801003, R801003, R802062 | Ford E9HT2308B, E9HT2308BA, E9HT2308BB, E9HZ2308B, F2HS2314DA, F8HZ2308AA | Freightliner 6814100849, 6814200849, 681-410-0849, 681-420-0849 | Mack 3398AS1038, 3398AS1138 | Navistar ZBRAS1038, ZBRAS1138 | Sirco Brake SA1138 | Volvo 1091671, 1092020, 3948970, 764010149, 8060852, 85100219, 76401-0149 | Western Star 764013469, 76401-3469 | Bendix 65167
DESCRIPTION:
Model: Automatic Slack Adjuster
Vehicles: Steer axle drum brake systems (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
• 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
• Mounting Hole Center Distance: 5.5"
• Piston Color: Yellow
• Max Torque Rating: <15 ft-lbs
• Vehicle Axle Position: Steer axle only
CROSS-REFERENCE(S):
A14-3275-Z-1144, R-803138, CS138, AS-1138, BHS-C300, CB25100, CB25102, CB35100, M3365, 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, 5037, RF840013018, SC300, F225066
A cross-reference listing means this part may be a compatible replacement for these part numbers
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
Warranty Information
