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Old 01-09-2005, 05:22 PM   #1
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Just got back from a weekend trip after my MH sat parked for two months. We've only had this W22 chassis MH for a few months so things are still new to us.

I know that the brakes have a booster pump or something like that but the whistleing noise seems louder now that it did the last time we were out 2 months ago.

Is it normal to get this high pitched noise when you apply the brake? and to hold your foot on the brake while stipped?
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Old 01-09-2005, 05:22 PM   #2
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Just got back from a weekend trip after my MH sat parked for two months. We've only had this W22 chassis MH for a few months so things are still new to us.

I know that the brakes have a booster pump or something like that but the whistleing noise seems louder now that it did the last time we were out 2 months ago.

Is it normal to get this high pitched noise when you apply the brake? and to hold your foot on the brake while stipped?
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Old 01-09-2005, 05:44 PM   #3
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I have the same "hiss" on my unit-previous threads about it indicate normal operation. Mine seemed to get a little louder after a couple of months also.
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Old 01-10-2005, 01:58 AM   #4
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Mine does the same thing and unfortunately it is normal AND ANNOYING! I'm not sure what produces the noise, but it has something to do with the Bosch Hydro-Max hydraulic brake booster system.

I've found the noise quiets down a bit if you reduce pressure on the brake pedal while stopped. I try to hold my foot on the brake just enough to keep the coach from rolling or just turn the radio up some!
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Old 01-10-2005, 01:52 PM   #5
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Well, I'm glad to be "normal" I too have found that by reducing the pressure will reduce the noise.

Sorry if this was a duplicate topic; I thought I had read far enough back but guess I should have done more searching.

Thanks..
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