OK viewers... it's time to play "Guess That Axle" - Page 2 - Fiberglass RV

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Old 07-07-2007, 10:47 PM   #15
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Name: Brian
Trailer: Boler (B1700RGH) 1979
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As far the brakes... can't imagine how those two wires hanging there by the hub could cause the [b]non-existant brake to operate!
It's actually quite simple...
... unless there are no brake components to which the wires could be attached.

Nice explanation, though...

1979 Boler B1700RGH, pulled by 2004 Toyota Sienna LE 2WD
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Old 07-08-2007, 06:25 AM   #16
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Trailer: Former 1978 Trillium 4500 owner
Posts: 47
With almost every trailer axle, the brake drum is the same cast hunk of metal as the hub. A no-brake (or "idler") hub is just the part containing the bearing and a flange big enough to hold the studs; a brake drum/hub is the same thing extended to a drum 7" or more in diameter with an inner surface machined for the brake shoes.

The other half of the brakes is the backing plate (a round stamped steel piece which closes off the open back of the drum and holds the brake parts, bolted to the axle, usually with four bolts). It would be strange to have a backing plate with no drum (but someone could do it if they needed a new hub and didn't bother keeping or properly removing the brakes); it would be even stranger to have a drum and no backing plate (since you can't get the backing plate off without removing the hub/drum).

The Dexter catalogs have nice illustrations of all of their components; here are 5-on-4.5" Dexter idler (left) and drum (right) hubs:

Attachment 8722

...and the backing plate with hardware (Dexter calls it a "complete brake assembly") in the view you would get if you removed the drum to expose the internals:

Attachment 8721

If someone put no-brake hubs on an axle which originally had brakes, you'd have the plain little hub, no backing plate, and just a place on the axle with four holes waiting for a backing plate to be installed. You get the same thing if someone factory-orders an axle without brakes, but prepared to accept them later; I have heard Trillium did this on the 1300 model.
THANKS FOR THE PHOTOS BRIAN... I do have the brake style hubs, but with no innards. At least now I know what I am dealing with. And thanks for the explanation of the brake function Pete, although Brian is correct that the wires for my brakes just hang by the axle but are not attached to anything.

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Old 07-08-2007, 05:28 PM   #17
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Umm, since the the brake controller, tow vehicle wiring, breakaway switch and brake plate w/components are all non-existent, everything is compatible for non-existent brake function and that's how it would work if it were all non˛-existent...

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axle, play–pac

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