Description
FP400-10211 - AUTO SLACK ADJUSTER - 28 SPLINE, 1 1/2" - 5.5"
PART NUMBER(S):
Fleet Products: FP400-10211 | OE: 400-10211, A35-3275-Z-1144, 3946257, E11921, 40020211, 40920002, 569640020211, M808019, MID40020211 | Automann: 133.284, 133.2840
DESCRIPTION:
Model: Automatic Slack Adjuster 16.5" Trailer Brake assembly
Vehicles: Compatible with heavy-duty truck and trailer drum brake systems (drive and trailer axles)
• Spline Count: 28
• Camshaft Diameter: 1.5"
• Arm Length: 5.5" (center-to-center)
• Mount Type: Straight (0" offset)
• Mounting Hole Center Distance: 5.5"
• Clevis Pin Diameter: 0.5"
• Body Angle: 0°
• Grease Fitting: Straight type, located at 180°
• Anchor Bracket Style: Plate and flat stud
• Material: Heavy-duty ductile nodular iron
• Performance/Technology:
– Factory lubricated and sealed
– Haldex/Midland style
– Long-stroke compatible
– Pull-pawl automatic adjustment mechanism
– Unhanded design with drilled worm wheel
– Heat-treated internal steel gears
– Meets or exceeds SAE J1461 standards
– Integrated hex nut for maintenance
– O-rings and gaskets for contamination sealing
• Brake Type: Drum brake
• Brake Chamber Compatibility: Suitable for Type 24/30 inferred (16.5" brake assemblies)
• Location: Rear axles (common use), drive or trailer positions
• Piston Color: Red (per Meritor A35-3275-Z-1144 documentation)
Applications:
Designed to automatically adjust brake slack on heavy-duty trucks and trailers using drum brake systems. Ideal for drive and trailer axles requiring 28 spline, 1.5" camshaft, and a 5.5" straight arm. The Haldex-style body allows for versatile, unhanded installation and improved brake balance under load. Factory-sealed and lubricated internals extend service life and reduce maintenance downtime.
CROSS-REFERENCE(S):
05-668, 10211, 10211P, 133.284, 133.2840, 23854SS, 3513974, 3946257, 400-10211, 400-10211C8T, 400-10211HTP, 400-10211-RC, 400-20211, 40010211, 40010211M1D, 40020211, 40020211M1D, 409-10236, 409-10237, 409-10386, 409-10398, 409-10430, 409-10471, 409-10683, 40910471, 40910683, 410211P, 42710563, 539640010211, 670-S23854, 808138, 813648, 818141, 86019, A86019, ABP N42AS, AM1332840, ATX23854, E-6944, E6944, EM50430, FC10211, FLT40010211, GTS23854, HA40010211, HAL-40010211, HAL40010211, HDX 40010211, HDX 40020211, K043197, L3609, L3618, M-4065, M807019, MD40010211, MD40020211, MID40020211, MIR-400-10211, MIR40010211, MPGS-23854, MSA40010211, PL-10211, PROSA56211, PS400-10211, R806019, R806019A, RB-10211, S 400-10211, S-23854, S23854, SA10211, SCSA10211, TDA R806019A, TF 400-10211, VTC-38542, VIP400-10211, WA 10211, WBA07135A, ZZ40020211
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:
✔ Follow OEM torque specifications during installation
✔ Use only 0.5" clevis pins and ensure straight arm alignment
✔ Verify that the zerk fitting is accessible post-installation
✔ Initial setup must ensure proper brake stroke clearance
✔ Grease if not factory-sealed; check service interval if applicable
✔ Inspect periodically for wear, cracks, or improper adjustment
✔ Replace if performance degrades or physical damage is detected
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