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Trailer Maintenace
Hydrastar Electric Over Hydraulic Brake Actuators (HBA & MHBA Series) – Technical, Installation & Owner’s Manual (PDF)
The Hydrastar Electric Over Hydraulic (EOH) Brake Actuator Technical Manual provides comprehensive instructions for proper setup, use, and maintenance of Hydrastar actuators, including models HBA-10, HBA-12, HBA-16 and MHBA-10, MHBA-12, MHBA-16.
Key topics include:
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Warnings & Requirements: Selecting the correct pressure rating actuator for drum or disc brakes, and ensuring compatibility with tow vehicle brake controllers.
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Wiring & Electrical Setup: Schematic diagrams, wire sizing, grounding, and controller integration for reliable performance.
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Installation Guidelines: Mounting location, brake line routing, and safe handling of DOT 3 or DOT 4 brake fluid.
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Brake Line Bleeding: Step-by-step bleeding process for both the actuator and trailer brakes, with safety precautions.
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Operation & Gain Control: How to adjust in-cab controller gain for optimal braking based on load and road conditions.
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Troubleshooting: Solutions for common issues such as delayed response, clicking, low pressure, or non-functioning breakaway systems.
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Replacement Parts & Compatibility: Adapter modules, fittings, installation kits, and updated compatibility with integrated brake controllers (GM, Ford, etc.).
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Warranty Information: Two-year limited warranty covering defects in material or workmanship when properly maintained.
This manual is an essential reference for installers, service technicians, and trailer owners working with Hydrastar HBA and MHBA electric over hydraulic brake actuators.