Description
A839X – POWER CLUSTER – AIR/HYDRAULIC ACTUATOR
PART NUMBER(S):
Fleet Products: A839X | Power Brakes: A839X | OE: FE777
DESCRIPTION:
Model: A839 / A839X – Brake Actuator Power Cluster with Master Cylinder 7" long X 1-3/4" dia. (FE777)
Vehicles: Heavy-Duty Truck and Trailer Brake Systems
• Type: Air-over-hydraulic brake booster
• Application: Heavy-duty truck and trailer brake systems
• Dimensions: 7.00 in air chamber diameter
• Dimensions: 4.00 in air chamber length
• Stroke: 1.75 in (44.45 mm)
• Master Cylinder Casting: FE777, 4-bolt design
• Mounting: Power cluster configuration
• Material: Remanufactured assembly
• Performance: Converts compressed air into hydraulic brake force
• Features: OEM-quality refurbishment, cleaned, inspected, and tested for durability and performance
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.
Warranty Information
