Product Description
A838X – POWER CLUSTER – AIR/HYDRAULIC ACTUATOR
PART NUMBER(S):
Fleet Products: A838X, A838 | OE: FE2704 | Automann: 6510L, 6510R, 6510
DESCRIPTION:
Model: A838X / A838 – Brake Actuator Power Cluster
Vehicles: Medium and Heavy-Duty Trucks & Trailers
• Output Pressure: 1000 PSI
• Stroke: 2.5"
• Diaphragm Type: Type 24
• Bore Size: 1 ½"
• Hydraulic Volume: 3.5 Cubic Inches
• Inlet Fitting: 5 1/16" Inverted Flare
• Air Chamber Diameter: 6"
• Air Chamber Length: 4"
• Master Cylinder Casting #: FE2704
• Mounting: Left-Side Bracket
• Actuation Type: Air/Hydraulic – pneumatic-to-hydraulic assist system
• Function: Converts air pressure to hydraulic braking force, enabling spring brake actuation or release where full pneumatic systems are absent
• Orientation: Horizontal mounting recommended to prevent fluid leakage and ensure reliable operation
• Fluid Compatibility: DOT 3, DOT 4, DOT 5, DOT 5.1, or mineral-based hydraulic oils
• Residual Check Valve: Integrated internally
• Unique Features:
– OEM-style replacement for Wagner-type clusters
– Fully leak and performance tested before shipment
– Compact size and ideal for retrofit or limited-space air/hydraulic applications
Applications:
Designed for legacy and retrofit installations on medium to heavy-duty vehicles, especially where intermittent pneumatic assistance is required. Commonly found in trailers, loaders (e.g., Clark Michigan 75B), and specialized vocational truck systems using air/hydraulic brake conversions.
CROSS-REFERENCE(S):
A838, A838X, 6510L, 6510R, 6510, A839, A840, 65-840L, 65-840R, AF838, AF839, AF840, 6510-1, 6510-2, 6510-3, 6510-4, 6510-5, 6510-6, 6510-7, 6510-8, 6510-9, 6510-10, 6510-11, FE2704
A cross-reference listing means the part can be used as a direct or functional replacement for the listed part numbers.
IMPORTANT INSTALLATION NOTES:
✔ Install in horizontal orientation to prevent internal seal failure or air entrapment
✔ Lubricate pivot point periodically to maintain performance
✔ Bleeding required after installation to remove trapped air from hydraulic system
✔ Use only fluid types compatible with the original system spec
✔ Confirm correct bracket side – A838X mounts on left-side
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
- Fast, reliable shipping across North America
- Competitive pricing with core return refunds
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