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Old 05-11-2021, 05:15 AM   #1
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Join Date: Jan 2020
Posts: 594
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
2001 Winnebago Brave SE29 Workhorse P32 7.4L (previous)
2007 Fleetwood Bounder 33R, F53 chassis, V10 (current)
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Old 05-11-2021, 06:34 AM   #2
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Holiday Rambler Owners Club
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Posts: 5,452

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. ;-)
2008 Holiday Rambler Admiral 30PDD (Ford F-53 chassis)
2009 Honda Fit Sport
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Old 05-11-2021, 06:46 AM   #3
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Thanks for the clarification. Another concern checked off.
2001 Winnebago Brave SE29 Workhorse P32 7.4L (previous)
2007 Fleetwood Bounder 33R, F53 chassis, V10 (current)
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brake, motor

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