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Old 10-10-2016, 02:11 PM   #11
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Originally Posted by Shultz01 View Post
I thought horn would be in the front near the bumper--but it was up on the firewall above the engine.
Yes, not the easiest place to access and work on things. I brought the new switched wires all to the horn area and then continued the air horn solenoid wire along the firewall and then down to the area I mounted my new horns and air regulator.
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Old 10-31-2016, 08:26 AM   #12
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So on yours, you talked about adding in a separate tank and what not to prevent pressure loss on the parking brakes. I am not sure on yours, but on mine, I have both a "P" guage/tank and a "S" guage/tank. I am assuming that "P" means primary and runs the brakes. "S" means secondary and it appears to run the rear air bags since that tank empties out when I level the coach. Does your coach have the rear air bags / second tank? I am under the impression that I should be able to tie an air horn into the secondary tank system without the risk of impacting my brakes....thoughts?
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Old 10-31-2016, 07:30 PM   #13
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So on yours, you talked about adding in a separate tank and what not to prevent pressure loss on the parking brakes. I am not sure on yours, but on mine, I have both a "P" guage/tank and a "S" guage/tank. I am assuming that "P" means primary and runs the brakes. "S" means secondary and it appears to run the rear air bags since that tank empties out when I level the coach. Does your coach have the rear air bags / second tank? I am under the impression that I should be able to tie an air horn into the secondary tank system without the risk of impacting my brakes....thoughts?
My 2014 has the rear Freightliner "AirLiner" air spring suspension, but since I do not have air brakes I only have one air "system" and no dashboard air gauge(s). My rig has hydraulically-boosted 4-wheel hydraulic disc brakes versus the newer units with air-actuated drum brakes.

On the older units like mine we do have a separate air-actuated driveshaft parking brake. If I lose all air it would come on as a safety measure, hence my addition of the pressure protection valve so I don't exhaust the air supply accidentally.

To your point, I do not know how Freightliner designed the air system, so I can't say whether tapping into the secondary side could compromise the air system. Your service brakes probably are are on the primary side, but your rear spring (parking) brakes might be on the secondary, as well as the rear suspension. I just do not know. If the rear spring brakes are on the secondary side, dropping pressure too low in that side might cause the parking brake to pop on unexpectedly. Bad news if you are rolling!
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Old 11-20-2016, 05:13 PM   #14
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If you think your current horn is not loud enough make sure you get one of these. I am sure you will get their undivided attention. Turn up the volume on your computer before watching

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Old 12-19-2016, 11:01 AM   #15
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Robbbyr - What size aire hose are you using? It looks like 1/4 inch, but the air input on my horn needs a bigger hose or a different connector to connect a 1/4 inch line to it. What size fittings did you use on either side of of the pressure protection valve? I ordered the same one you used, but the threaded openings look really big to me.



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That is what I did, put a smaller tee into the existing larger one.

To mount my new air tank I fabricated two brackets out of 1.5" x 1/8" steel flat stock forming them into a "J". The throat of the "J" was calculated to allow the "J" to rest on the frame rail (did not want to drill and weaken it) and then the bracket extended under, and bolted to, the battery slideout tray fixed mount. The new air tank then hangs upside down and bolts to the two "J" brackets. I had to be careful and offset the brackets and the holes to mount the tank since the spacing of the air tank's holes and the battery tray mounts are slightly different. After installation I undercoated everything, and I had even painted the "J" brackets before installing to help them last.

Here are some pictures with some callouts pointing out the details. Hope they help.
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Old 12-19-2016, 12:53 PM   #16
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Robbbyr - What size aire hose are you using? It looks like 1/4 inch, but the air input on my horn needs a bigger hose or a different connector to connect a 1/4 inch line to it. What size fittings did you use on either side of of the pressure protection valve? I ordered the same one you used, but the threaded openings look really big to me.
My hose is all 1/4" nylon air brake hose. My horn's solenoid valve came with the correct 1/4" compression fitting, if your horn connection is larger you may have to adapt the fittings to get things to connect.

My PPV (from Amazon) has 1/4" threaded pipe fittings on its inlet and outlet. The inlet side of the valve it is connected with a short 1/4" pipe nipple directly to a new tee I installed at the tank outlet. Originally there was just a single air line to the engine's fan clutch there as you can see in Shultz01's picture earlier in this thread. In my annotated pictures you can see the added tee and the new PPV hooked to it. Then out of the PPV I installed a 1/4" pipe thread to 1/4" compression fitting to adapt it to the air line going to my additional air storage tank. At the new tank it tees again to go to the horns and the fill station I mounted underhood.

I can tell my PPV works as intended. If I let the MH sit for a while and the air system leaks down, when I first start the engine I have no (or very weak) air horns. After just a minute of the engine running I will hear a "rush" of air into my added tank, that is when the main air system has built up enough pressure to allow the opening of the PPV to fill my new "secondary" air system. After that system fills the horn works as intended.

If you need any other help or more pictures I can get them, my storage area is 5 minutes away and I visit it regularly in the off season! I am happy to help however I can.
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Old 12-20-2016, 08:33 AM   #17
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Thank Robbbyr

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Originally Posted by Robbbyr View Post
My hose is all 1/4" nylon air brake hose. My horn's solenoid valve came with the correct 1/4" compression fitting, if your horn connection is larger you may have to adapt the fittings to get things to connect.

My PPV (from Amazon) has 1/4" threaded pipe fittings on its inlet and outlet. The inlet side of the valve it is connected with a short 1/4" pipe nipple directly to a new tee I installed at the tank outlet. Originally there was just a single air line to the engine's fan clutch there as you can see in Shultz01's picture earlier in this thread. In my annotated pictures you can see the added tee and the new PPV hooked to it. Then out of the PPV I installed a 1/4" pipe thread to 1/4" compression fitting to adapt it to the air line going to my additional air storage tank. At the new tank it tees again to go to the horns and the fill station I mounted underhood.

I can tell my PPV works as intended. If I let the MH sit for a while and the air system leaks down, when I first start the engine I have no (or very weak) air horns. After just a minute of the engine running I will hear a "rush" of air into my added tank, that is when the main air system has built up enough pressure to allow the opening of the PPV to fill my new "secondary" air system. After that system fills the horn works as intended.

If you need any other help or more pictures I can get them, my storage area is 5 minutes away and I visit it regularly in the off season! I am happy to help however I can.


That is helpful. My air tank has several more ports in the tank for me to tap into instead of having to add onto the fan clutch like you did. I was planning on removing the plug at one of the two positions on the right and running from there to my PPV and then on to my Horn. Where did you buy the fittings you used to connect the brake hose to the PPV and the horn?
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Old 12-20-2016, 11:22 AM   #18
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That is helpful. My air tank has several more ports in the tank for me to tap into instead of having to add onto the fan clutch like you did. I was planning on removing the plug at one of the two positions on the right and running from there to my PPV and then on to my Horn. Where did you buy the fittings you used to connect the brake hose to the PPV and the horn?
Those look like good points to tap into in my opinion. I would suggest you adapt to the tank with solid fittings to the PPV (brass bushing and a short nipple) rather than remote-mounting the PPV and connecting it with tubing. I suggest that so there is less chance of line failure causing you to lose air in your chassis' main air system.

I got my fittings and air tubing from a local NAPA store that specializes in heavy trucks. Had a great assortment of air brake-rated fittings. While a big-box home improvement store might have similar fittings, the ones they sell for trucks are DOT-rated. Might not functionally make a difference, but I tend to err on the side of caution. And I thought the cost for my items was very reasonable.
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Old 12-20-2016, 02:10 PM   #19
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I would HIGHLY suggest to tap into the secondary tank, not the primary tank. Even though you are using PPV, the secondary tank runs the rear air bags and the front brakes, the primary tank runs the rear brakes but more importantly, the parking brake, which engages if you lose pressure. I don't know from experience, but you can see this happens often if you drive down the freeway and you randomly see tire marks on the pavement and them dragging their way off the road. Most of these occur due to loss of pressure and brake lockup occurring. I expect that under my tree right now is a box which has a triple trumpet kit in it and I will be doing this install sometime next week if everything I asked for comes
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Old 12-20-2016, 03:22 PM   #20
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secondary tank?

I don't recall seeing one, but I'll look again. I have 2 pressure gauges in my instrument panel and sometimes I hear the compressor noise from further back in the coach, instead from near the cab area, so I assume I have a secondary tank and maybe a secondary compressor.
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