Product Description
FP400-10212 - AUTO SLACK ADJUSTER - 28 SPLINE, 1 1/2" - 6"
PART NUMBER(S):
Fleet Products: FP400-10212 | OE: 400-10212, A41-3275-Z-1144 | Automann: 133.2841, 135.2841
DESCRIPTION:
Model: Automatic Slack Adjuster
Vehicles: Compatible with various heavy-duty vehicles including trailers from Freightliner, Volvo, Mack, and others
• Spline Count: 28
• Camshaft Diameter: 1 1/2"
• Arm Length: 6" (center-to-center)
• Mount Type: Straight arm, 0° offset
• Mounting Hole Center Distance: 6"
• Clevis Pin Size: 1/2"
• Body Angle: 0°
• Brake Type: Drum brake
• Chamber Size Compatibility: Designed for 16.5" brake assemblies (Type 24/30 inferred)
• Lubrication: Zerk fitting (180° location; optional maintenance)
• Piston Color: Yellow (stroke-sensing type)
• Technology: Automatic pull-pawl, unhanded design with drilled worm wheel
• Construction: Heavy-duty ductile nodular iron, heat-treated steel alloy gears, hex nut for maintenance, O-ring sealed
• Sensing Type: Stroke-sensing
• Performance: Long-stroke compatible, forged steel durability
• Mount Interface: Plate & Flat Stud anchor bracket
• Application Type: Factory-sealed OEM replacement for trailer and drive axle configurations
Applications:
Used extensively in trailer and drive axle positions across various commercial truck and trailer platforms requiring 28-spline, 1 1/2" camshaft diameter, 6" straight-arm automatic slack adjusters. Designed to maintain proper brake adjustment in heavy-duty air brake drum systems, especially in fleet applications where maintenance efficiency and braking safety are critical.
CROSS-REFERENCE(S):
400-10212, A41-3275-Z-1144, 40010212, 400-10305, 40010305, 40010140, 40010144, 40020212, 40010305MID, 40020212MID, 409-10234, 409-10235, 409-10352, 409-10472, 409-10673, 429-10673, 10212, 10212P, 3508808, 410212P, 539640010212, 818142, ABPN42AS40010212, E-6942, E6942, M807013, R806013A, EM50440, FC10212, FLT40010212, HA40010212, HAL-40010212, HDX40010212, HDX40020212, L3610, M-4066, MD40010212, MD40020212, MID40020212, MIR-400-10212, MSA40010212, PL-10212, PROSA56212, R806013, RB-10212, S-23855, S23855, SA10212, TDAR806013A, WBA07115A, 05-662, 23855SS, 400-10212C8T, 400-10212-RC, ATP23855, ATX23855, GTS23855, MPGS-23855, MIR40010212, MIR-400-10212, S400-10212, TF400-10212, VIP400-10212, VTC-38552, A86013, K041877, KO41877, 060-K041877, 060-KO41877, BXK041877, K041877BXW, 745-K041877, 745K041877, R801074, R802486, R802487, R802490, R802491, MK22106S, MK42106S, E-11402, E11402, E-11421, E11421, E-11422, E11422, E-11423, E11423, E-11424, E11424, OTR65175, 065175, 065176, AS1041, AS1141, AS1173
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 following OEM and manufacturer torque specs and setup procedures
✔ Confirm proper initial setup and stroke before vehicle operation
✔ Use only compatible clevis and hardware; 1/2" pin standard
✔ Ensure zerk fitting is accessible if maintenance greasing is required
✔ Mount the arm straight—misalignment can impair brake balance
✔ Inspect regularly for wear and correct adjustment function
✔ For best performance, verify chamber compatibility and replace in matched sets when needed
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
WHY CHOOSE FLEET PRODUCTS | KBR - HEAVY DUTY TRUCK & TRAILER PARTS?
- Canadian-owned and operated since 1985
- Trusted by fleets, mechanics, and B2B partners across North America
- Fast, reliable shipping across North America
- Competitive pricing with core return refunds
- Price Match Guarantee | Find a better price? We'll beat the difference by 10%!
