Eaton 6-speed Transmission Electronic Front Brake
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Eaton 6-speed Transmission Electronic Front Brake

This is the electronic inertia brake (input shaft brake) fitted to Eaton 6-speed medium-duty automated manual transmissions (UltraShift DM3 series, e.g., FO-6406, FO-5406 etc.), also known as the front transmission brake assembly. It is an electronically controlled brake unit mounted near the clutch housing/input shaft, controlled by the TECU/TCU. Its core function is to slow the input shaft/countershaft speed during gear shifts for fast, synchronized gear meshing, support hill start assist, and prevent gear grinding and shift shock. It resolves faults such as slow shifting, grinding noise, failed gear engagement, hill start rollback, and inertia brake fault codes, widely used in medium-duty commercial trucks, buses and vocational vehicles.

 

Availability:
Quantity:
  • FS0-6406A

  • Eaton

Product parameters

Basic Info

    • Compatible Gearbox: Eaton 6-speed medium-duty UltraShift automated manual transmissions (DM3 series 6-speed AMT)

    • Product Type: Electronic Inertia Brake Assembly (Input Shaft / Front Housing Inertia Brake)

    • Control Mode: TCU electronic control (solenoid/electric motor actuation, CAN/J1939 communication)

    • Mount Location: Front clutch housing / input shaft area of the 6-speed Eaton AMT gearbox

    • Material: Cast housing, friction plates, solenoid/electric actuator, sensors, seal components

    • Function: Synchronize input shaft speed during shifting, reduce shift time and noise, hill hold assist, dampen residual shaft rotation

    • Applicable Vehicles: Medium-duty trucks, delivery vehicles, school buses, RVs with Eaton 6-speed UltraShift AMT transmissions

    • Category: Eaton Heavy/Medium Truck Transmission Spare Parts – AMT Shift Control Components



  • Material & Advantages


  • Heavy-duty cast housing + durable friction pack, withstands repeated dynamic braking and chassis vibration

  • Electronic closed-loop control by TCU, accurate speed regulation for fast smooth shifts, reduce shift impact and gear wear

  • Integrates position/speed sensors for feedback and fault diagnostics, supports vehicle hill start assist functions

  • Standard mounting form factor matching Eaton 6-speed medium-duty AMT gearboxes, direct replacement during overhaul

  • Reduces premature synchronizer wear, improves transmission durability and shift quality



Application


For Eaton 6-speed medium-duty AMT transmission maintenance and overhaul. Replace when the inertia brake has friction plate wear, solenoid failure, sensor damage, or triggers inertia brake fault codes, resulting in grinding shifts and hill start issues. Inspect wiring, connectors, and solenoid circuits; check friction plate clearance and wear; perform TCU calibration/reset and clear fault codes after replacement; test shifting and hill start function to confirm normal operation. Follow Eaton official service manual torque and adjustment specs.



Origin & Lead Time

In stock, delivery within 1–3 working days; bulk orders: 4–7 days; sea freight: 10–24 days


MOQ & Packing

MOQ: 1 piece
Warranty: 6 months, not covered for improper programming, water damage, overvoltage and unauthorized circuit modification
Packing: Anti-static bag + shockproof foam + reinforced export carton

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Company information (1)

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Our company was founded in Hubei province, China, and has been specialized the truck gearboxes in Chinese offline market for 21 years .Our parts are the leader of gearboxes area in the China now.


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