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 > SMI Air Force One install

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rvroamerrandy

Yorba Linda CA

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Posted: 02/26/21 07:02am Link  |  Quote  |  Print  |  Notify Moderator

Good Morning al. Just purchased the air force one proportional braking system. My question is do I need to dump the bags and jacks prior to cutting my supply and metered lines on the coach? I have a 2011 Winn Journey on a Freightliner chassis. the coach is too low to leave on the ground without the jacks. I am a big guy so either jacks up or i pull it up on blocks? need some advice here. I understand i need to pump brakes 3 or 4 times to release the air in system but not sure if this effects jacks? I appreciate some direction here if anyone has some. My fear for some reason is being under the coach, cutting the lines and the coach starts rolling.

2011 Journey 40U
2020 Chevy Trail Boss

Randy

* This post was edited 02/26/21 07:27am by rvroamerrandy *

CA Traveler

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Posted: 02/26/21 08:01am Link  |  Quote  |  Print  |  Notify Moderator

You are courting potentially extreme danger! The chassis needs to be throughly supported by mechanical jacks period. People have been killed from falling vehicles.

Based on your questions you should give very serious thought to having the unit installed in the MH.


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67Cutlass

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Posted: 02/26/21 09:23am Link  |  Quote  |  Print  |  Notify Moderator

To answer the OP's question. Your air bags and jacks are not in any way connected to your air brake system. No you do not need to dump the bags and jacks.

Just keep safety in mind when doing this.


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Lwiddis

Bishop area, California

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Posted: 02/26/21 09:45am Link  |  Quote  |  Print  |  Notify Moderator

Danger lurks under an RV, truck, car etc. Be careful.


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CA Traveler

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Posted: 02/26/21 01:00pm Link  |  Quote  |  Print  |  Notify Moderator

67Cutlass wrote:

To answer the OP's question. Your air bags and jacks are not in any way connected to your air brake system. No you do not need to dump the bags and jacks.

Just keep safety in mind when doing this.
Yes but the AF1 unit in the motor home requires both the brake line and a supply line meaning the main tank will be empty. Perhaps just one step closer for the air bags to become deflated.

67Cutlass

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Posted: 02/26/21 01:28pm Link  |  Quote  |  Print  |  Notify Moderator

CA Traveler wrote:

67Cutlass wrote:

To answer the OP's question. Your air bags and jacks are not in any way connected to your air brake system. No you do not need to dump the bags and jacks.

Just keep safety in mind when doing this.
Yes but the AF1 unit in the motor home requires both the brake line and a supply line meaning the main tank will be empty. Perhaps just one step closer for the air bags to become deflated.


Even if you empty both air tanks that will not dump the air out of the inflated bags.

The bags are not dumped until you level the mh using the automatic leveling system or manually dump the air bags.

With the suspension fully inflated you can still manually extend the jacks and keep the bags inflated.

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Posted: 02/26/21 03:06pm Link  |  Quote  |  Print  |  Notify Moderator

67Cutlass wrote:

CA Traveler wrote:

67Cutlass wrote:

To answer the OP's question. Your air bags and jacks are not in any way connected to your air brake system. No you do not need to dump the bags and jacks.

Just keep safety in mind when doing this.
Yes but the AF1 unit in the motor home requires both the brake line and a supply line meaning the main tank will be empty. Perhaps just one step closer for the air bags to become deflated.


Even if you empty both air tanks that will not dump the air out of the inflated bags.

The bags are not dumped until you level the mh using the automatic leveling system or manually dump the air bags.

With the suspension fully inflated you can still manually extend the jacks and keep the bags inflated.
Good to have more detail on the operation.

But what does this have to do with safety regarding being under the MH with just the jacks and air bags?

rvroamerrandy

Yorba Linda CA

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Posted: 02/26/21 07:02pm Link  |  Quote  |  Print  |  Notify Moderator

WOW, that stirred up a whole slew of conversation. I Just want to make sure that safety s first. I'm not much worried about the installation process other than the cutting of the brake line. I guess the real question I should have asked is, is the emergency brake anyway connected to this supply line or metered line that I will be cutting? I appreciate everyone's comments and I look forward to more replies.

Thanks,
Randy

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Posted: 02/26/21 09:28pm Link  |  Quote  |  Print  |  Notify Moderator

Emergency air brakes are different. A big spring applies the ebrake when there is no air pressure. When you release the ebrake switch you are actually sending air pressure to the ebrake to pull the big spring back and disengage the ebrake.

ie Think losing air pressure for some reason to the point where the service brakes don't work and then the ebrake will be applied.

robatthelake

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Posted: 02/27/21 08:40pm Link  |  Quote  |  Print  |  Notify Moderator

The auxiliary system airline should be connected to one of the unused outlet points on the rear air brake manifold!


Rob & Jean
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