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Old 01-28-2015, 10:37 PM   #11
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Quote:
Originally Posted by Donna D. View Post
Okay, this is old SKOOL and maybe totally wrong, but I thought only the leading axle should provide brakes on a tandem axle trailer. The rear axle shouldn't even be braking unless extreme conditions.

But what do I know...
The front and rear axles (and their brakes) are the same on an Escape AFAIK.

I would think that brakes on all 4 wheels would mean better braking and less wear than only on two. I do know that some states require brakes on all 4 wheels of a tandem axle, depending on the weight of the trailer. The common maximum for only requiring brakes on one axle is usually around 3000 lbs. Over that, you need them on both.
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Old 01-28-2015, 10:38 PM   #12
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Originally Posted by Rossue View Post
The mechanic noticed the rear end rising up during parking lot braking with controller only.
The rear will rise relative to the front under normal braking. Since the ball is below the centre of mass, it will even rear up if just stopped by the tug. I don't think either is a good indication of a problem with load distribution between the axles.

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He thought the rear end was light and it might be better to fill the empty fresh water tank that sits behind the rear axle.
I get the logic, but it is hard to fix bad distribution between the axles by minor load shifts. Adjusting the ball height, on the other hand, rapidly changes the distribution. You could deliberately shift the load to the trailing axle and if the same wheel still locks, it's definitely a mechanical problem with that brake.

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Originally Posted by Devil Dog View Post
It may be that there is not enough weight over that tire.
...
Or it could be a twisted frame . You may want to have the frame checked.
I think that much frame twist would be really noticeable at the ends. I've seen photos of a trailer with a frame twist problem that caused suspension issues, but that was the notoriously flimsy Fiber Stream frame, not the robust Escape frame.
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Old 01-29-2015, 12:52 AM   #13
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Originally Posted by Donna D. View Post
Okay, this is old SKOOL and maybe totally wrong, but I thought only the leading axle should provide brakes on a tandem axle trailer.
Very "old school", and as Robert pointed out, not even legal in some cases. For example, in British Columbia any trailer requiring brakes requires them on both axles of a tandem.

Other than just being cheap, there was a reason for brakes only one axle, and specifically the leading axle. Long ago, when there was only crude control of the trailer's brakes, braking risked locking up the trailer wheels. With brakes on only the leading axle, the trailing axle wheels kept rolling and so the tires retained traction and the trailer remained in control. The trailing axle tires are better placed for control than the leading tires.

With a modern trailer brake controller, there is no reason to have brakes on only one axle. Not putting brakes on the other axle means you can't use the traction of that axle's tires, and have no hope of achieving any reasonable level of braking.

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Originally Posted by Donna D. View Post
The rear axle shouldn't even be braking unless extreme conditions.
Unlike a car or pickup truck, a trailer doesn't have a proportioning valve to vary the braking effort between front and rear - let alone the now-standard computer-controlled Electronic Brake Force Distribution system - and it doesn't need one. The leading and trailing axle brakes do the same thing at the same time.


Similarly, long ago a big truck might have no brakes at all on the front axle. With poorly controlled braking systems and low standards for braking performance, skipping the front brakes entirely ensured that the steering axle tires were never locked up so steering control wasn't lost. Imagine if a trucker brought a rig into a modern inspection station with the front brakes entirely missing!
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Old 01-29-2015, 12:53 AM   #14
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Originally Posted by rbryan4 View Post
The front and rear axles (and their brakes) are the same on an Escape AFAIK.
Yes - two identical axles, with identical brakes on them. That's normal trailer practice, and specifically the case for tandem Escapes.
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Old 01-29-2015, 03:49 PM   #15
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Problem fixed: having the hub machined resolved the wheel locking up. Now have the P3 set at Boost 1 and 4.8.
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Old 01-29-2015, 04:40 PM   #16
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Excellent.
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Old 01-29-2015, 05:11 PM   #17
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Problem fixed: having the hub machined resolved the wheel locking up. Now have the P3 set at Boost 1 and 4.8.
Good! Interesting that the hub was defective since the trailer is so new. Manufacturing defect?
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Old 01-29-2015, 06:42 PM   #18
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It was likely a manufacturing defect which means this has been going on since it was new. Am a little hearing impaired and it was my wife who noticed it-she does sit on that side as well. Seemed to only be an issue coming to a stop, but who knows for sure.

Dexter has been excellent from the start and they are going to pay for a new tire as well as the labor- I didn't have to ask!
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Old 01-29-2015, 06:52 PM   #19
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Problem fixed: having the hub machined resolved the wheel locking up. Now have the P3 set at Boost 1 and 4.8.
The brake drum was machined and cut true ??
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Old 01-29-2015, 07:21 PM   #20
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The brake drum was machined and cut true ??
Yes- just called the shop and they verified that is what was done.

When I mentioned to Dexter the mechanic's suggestion to do this they replied that was what they were going to next suggest as well.
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