Troubleshooting Weak Output From A Hydrastar Electric-Over-Hydraulic Actuator
Updated 12/15/2025 | Published 11/11/2024
Products Featured in This Question
Question:
If my hydrastar pump is working but the braking power is very weak, is this a sign that the pump is going out?
asked by: Casey
Expert Reply:
Hey Casey,
That could be one possibility but it could also be that the brake shoes are worn and need to be adjusted/replaced or you could just be low on fluid. I would start by removing your hubs and checking the brake assemblies out and adjust as needed. If you need to replace them we'll need to either know the dimensions of the assembly (see picture below) or the axle capacity to pick out a replacement.
Next you can check the fluid levels in your actuator and fill as needed. You might also want to just bleed the brakes to be 100% sure that you don't have air bubbles in the line weakening the pressure. Next I would check the power running to the actuator with a multimeter to see if you could potentially have a voltage drop or issue with the brake controller. Do you use a factory brake controller or an aftermarket one? Factory brake controller are known to have a delay in communication with Electric-Over-Hydraulic (EOH) actuators, which can cause weak or zero braking power.
Some manufacturers have adapters to help the factory brake controller communicate with the actuator but there's no guarantee that they'll work. For Hydrastar if you have a GM or Ford you would need adapter # HBA-CAM. I typically recommend just switching to an aftermarket brake controller that's EOH compatible like the Tekonsha P3 # 90195 to avoid any issues. Let me know what you find and we can keep troubleshooting.
Product Page this Question was Asked From
Hydrastar Vented Marine Electric Over Hydraulic Actuator for Drum Brakes - 1,000 psi
- Brake Actuator
- Electric-Hydraulic Brake Actuator
- Boat Trailer
- Travel Trailer
- Drum Brakes
- Hydrastar
more information >
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on Brake Actuator
Lazer S.
12/15/2025
Hey Casey, what ended up helping with the weak braking on your Hydrastar actuator? Your update could make it easier for others trying to track down the same issue.