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Old 06-12-2012, 01:49 PM   #1
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Tag axle questions

Iím getting ready to do some service on the TAG axles. I want to check the brakes and replace/repack anything that needs service. I have a few questions before I start:

Anyone know where the brake controller is for my 92 LY?

How do I test the TAG brakes while stationary? (Iíve read about a lever on the controller box)

Will the Dexter Nev-R-Adjust 12x2 brake assemblies fit? What weight limit (#5200, #6000, #7000)


What else should be check besides the brakes, bearings and seals?

What's the best way to lift the wheel off the ground?
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Old 09-30-2013, 11:17 AM   #2
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Yea me too. I just started to get around to fixin my tag brakes and found the brake controler has been wired for a trailer instead of the tag brakes. Unless there is a controller somwhere else.
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Old 10-01-2013, 07:39 AM   #3
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The factory installed controller on my 36' 92 LY was mounted inside the driver's side front fender near the front on the frame. It's a black finned box. I eventually cut the wires and spliced in a better controller mounted inside the cab.
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Old 10-01-2013, 08:27 AM   #4
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ok i Saw that inside the fender. there was a brake controller mounted under my dash and I assumed that is what operating my rear brakes. is there a way to find out if that little black box works correctly
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Old 10-01-2013, 09:10 AM   #5
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Make super sure that the tag axle is properly cared for.

The bearings must be repacked once a year or every 10,000 miles.

The brake assembly can be any rating, since the axle is rated at 3000 pounds.

Until very recently, the tag axle was in the catergory of no longer available.

However, with considerable investment in time, etc, we have managed to have at least one model recreated.

Andy
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Old 10-01-2013, 04:52 PM   #6
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Andy, or someone who knows, how do you test the controller (finned black box)
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Old 10-01-2013, 06:53 PM   #7
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Andy, or someone who knows, how do you test the controller (finned black box)
Have one tag axle tire in the air.

Have someone rotate it and while they are doing that, apply the controller, and see what happens.

Keep in mind thast the tag axle brake is the same as on the trailers.

Therefore it should be inspected every 10,000 miles as well as having the bearings lubed and the grease seals changed.

Typically, most owners wait until it's too late to address the tag axle issues.

Tag axles are torsion axles that behave the same way that they do on a trailer.

Do they have a life?

Yes, the same as if they were on a trailer.

As the rubber rods slowly give out, the air bags must then carry more pressure than normal. That extra pressure on old air bags can cause them to fail.

Tag axles certainly deserve PM, on a regular basis.

Andy
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Old 10-02-2013, 04:57 AM   #8
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Have one tag axle tire in the air.

Have someone rotate it and while they are doing that, apply the controller, and see what happens.

Keep in mind thast the tag axle brake is the same as on the trailers.

Therefore it should be inspected every 10,000 miles as well as having the bearings lubed and the grease seals changed.

Typically, most owners wait until it's too late to address the tag axle issues.

Tag axles are torsion axles that behave the same way that they do on a trailer.

Do they have a life?

Yes, the same as if they were on a trailer.

As the rubber rods slowly give out, the air bags must then carry more pressure than normal. That extra pressure on old air bags can cause them to fail.

Tag axles certainly deserve PM, on a regular basis.

Andy
I do not have a controller in the cab. I have a black box in the driver fender.
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Old 10-03-2013, 07:47 AM   #9
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I don't know of a way to test the factory black box since it has no manual actuation provisions. It has a gain control knob but no other input. Simply pressing on the brake does not engage the brakes on the TAG. I replaced mine with a Tekonsha Prodigy P2 since water was dripping out of the gain control knob when I removed the cap. Between that and no way to test it, I decided to just replace with a better unit.
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Old 10-03-2013, 04:04 PM   #10
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I just ordered a DEXTER Predator DX2 to mount in the cab . For peace of mind.
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Old 10-03-2013, 05:51 PM   #11
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Probably your best option. I just wired the Prodigy into the same wires that went to the original black box. I just cut the wires going to the stock box and spliced the new controller in its place. They both (as most) will have the same wire color code.
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Old 10-11-2013, 06:25 AM   #12
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Oh yea, my brakes work now. I wish I would have went the route you went with buying the whole backing plate and self adjusting brakes. I will be readjusting these this spring. I also wired the tag brakes so they will also control trailer brakes too.
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