Trailer Life Directory Open Roads Forum: Class A Motorhomes: Aftermarket air dump add-on?


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Jhureau881

SW Ohio

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Posted: 11/05/09 08:35am

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Our 97HR (Freightliner XC chassis) was not equipped with an air dump switch for the suspension.

I'd like more range of motion for the leveling jacks - i.e. in some instances, if I can get the front lower, the back doesn't have to come up as much. Basically, if the front or rear would dump air, I'd be able to level more effectively.

Anyone know of an aftermarket way (kit) of doing this? I'd imagine there would be a few air solenoid valves connected to a relay and switch.

Scott Hureau
97 HR Endeavor 37CDS CAT

YC 1

Yuba City Calif.

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Posted: 11/05/09 09:09am

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I pump my brakes with the engine off and it comes down much faster than using the air dump valve by itself. Maybe yours will dump quick with the brakes too.

H/R Endeavor 2008
2007 Hummer H3 toad
Ranger Boat

Jhureau881

SW Ohio

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Posted: 11/05/09 09:10am

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I thought there was a check valve in the airbags that prevented the suspension from lowering when there is no air pressure remaining?

YC 1

Yuba City Calif.

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Posted: 11/05/09 09:31am

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Jhureau881 wrote:

I thought there was a check valve in the airbags that prevented the suspension from lowering when there is no air pressure remaining?

Maybe I'm just seeing an illusion but in any case dumping the brake air assures me no one can release my parking brake. I will check it out again this weekend. We have had it for a year now and still learn new stuff all the time.

MCICOACH

Kansas

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Posted: 11/05/09 06:43pm

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YC 1 wrote:

Jhureau881 wrote:

I thought there was a check valve in the airbags that prevented the suspension from lowering when there is no air pressure remaining?

JH is right. There should be a check valve to prevent the air to escape out of your airbags. If you do settle down, you probably have a bad check valve.

FWIW

God bless,

John

YC 1

Yuba City Calif.

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Posted: 11/06/09 01:25pm

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MCICOACH wrote:

YC 1 wrote:

Jhureau881 wrote:

I thought there was a check valve in the airbags that prevented the suspension from lowering when there is no air pressure remaining?

JH is right. There should be a check valve to prevent the air to escape out of your airbags. If you do settle down, you probably have a bad check valve.

FWIW

God bless,

John

I learned something new. It does not drop with the brakes as mentioned. Guess that PDI point was just so the brake can't get pushed and then the coach rolls. That makes more sense anyway.

runway18-2

missouri

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Posted: 11/06/09 02:21pm

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Check with Freightliner. My coach has a mechanical dump valve which is identical to the ones on road tracktors. It is located by the shift pad. You might have to run an airline & cut a mounting hole to intall this type.

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