Product Description
A839X – POWER CLUSTER – AIR/HYDRAULIC ACTUATOR
PART NUMBER(S):
Fleet Products: A839X | Power Brakes: A839X | OE: FE777
DESCRIPTION:
Model: A839X – Brake Actuator Power Cluster
Vehicles: Heavy-Duty Truck and Trailer Brake Systems
• Air Chamber Diameter: 7"
• Air Chamber Length: 4"
• Stroke: 1 ¾" (44.45 mm)
• Master Cylinder Casting #: FE777 (4-bolt design)
• Actuation Type: Air/Hydraulic (implied by power cluster designation)
• Build Standard: OEM quality refurbishment with cleaning, inspection, and testing to ensure durability and performance
• Function: Converts compressed air pressure into hydraulic force to assist braking systems
• Application: Designed primarily for heavy-duty truck and trailer brake actuation where air/hydraulic power clusters are required
Applications:
Suitable for use in heavy-duty trucks and trailers equipped with air/hydraulic brake systems utilizing master cylinders with FE777 casting.
CROSS-REFERENCE(S):
A839X, FE777
A cross-reference listing means this part is a suitable replacement for the parts listed and should be verified for fitment before purchase.
IMPORTANT INSTALLATION NOTES:
✔ Install following OEM guidelines for air/hydraulic actuators
✔ Confirm compatibility with master cylinder casting FE777 before installation
✔ Bleeding of hydraulic system required post-installation to ensure proper operation
SOLD AS REMANUFACTURED | CORE RETURN REQUIRED
Built to OEM standards | thoroughly cleaned, inspected, and tested to ensure durability, performance, and reliability in demanding applications.
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
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