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US1 05-11-2021 05:15 AM

HydroMax brake motor
The hydra max boost pump on mine sounds like a garbage disposal grinding up a full course meal. Normal?

When the engine is running, I don’t hear it. I assume the PS pump is taking over for the electric motor? Fluid level is full and brakes operate fine.
The loud noise is main concern. I’m trying to run a scan of my motor with the motor off and the running pump is crazy loud. Are they normally noisy loud?

I listened to a guy that has the same RV but a WH chassis and his was just a hum

l1v3fr33ord1 05-11-2021 06:34 AM


The HydroMax unit should run only when the engine is off.

Yes, it sounds awful. My coach's runs while I'm leveling the coach. Makes me move through the process quickly. ;-)

US1 05-11-2021 06:46 AM

Thanks for the clarification. Another concern checked off.

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