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Discussion Forum

Trailer brake vibration

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Butch (OH)

08-16-2001 06:52:11




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When I spec'd out my gooseneck I had them put the biggest brake option on the 7,000# torsion ride axles. It will slide the tires with 4.5 ton of tractor on board if you turn the controller up far enough. problem is that when the trailer is empty, or with a light load I have to turn the controller almost off to keep from sliding the trailer tires and a terrible vibration shakes the whole outfit when I apply the brakes. The dealer said "that's what you get for wanting those big brakes, they all do that" How's that for service? Anyway I have checked the drums and they are round, nothing loose that I can find. Anybody have suggestions for a fix?

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Mark

08-21-2001 10:48:05




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 Re: Trailer brake vibration in reply to Butch (OH), 08-16-2001 06:52:11  
My dad has the same problem with his trailer. He installed a switch that lets you select brakes on one axle or both axles. When the trailer is empty and brakes are activated on one axle, the hopping problem is gone.



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REDNECKMAT

08-16-2001 18:43:03




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 Re: Trailer brake vibration in reply to Butch (OH), 08-16-2001 06:52:11  

Butch if you email me I can give you the phone # for the company I work for we are a trailer parts wholesaler probley where your parts came from. We have a location in OH they could help you or get you in touch with the correct person.



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Jerry D in NC

08-16-2001 15:48:47




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 Re: Trailer brake vibration in reply to Butch (OH), 08-16-2001 06:52:11  
If you have a modern brake controller then it pulsates as it slows down. You should be able to adjust the juice to those brakes until they don't engage as it comes to a stop very hard and it will stop that. Also they will soften some as the new wears off of them too. What you have done is specify a set of brakes that will stop a 10 ton load and they whup up on an empty trailer.



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Butch (OH)

08-16-2001 20:13:09




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 Re: Re: Trailer brake vibration in reply to Jerry D in NC, 08-16-2001 15:48:47  
Jerry, My controller is one of the inertia type. The way I set it when I have a light load is to set the brake force up just far enough to slide the tires when I use the manual "Max brake" button, I then rotate the inertia knob until the brakes don't apply when sitting still, but start applying under slight braking. Don't know if this is exactly the right way to adjust it but the thing was made in France with translated instructions. The rig is just heavy enough that I am uncomfortable shutting them off when empty. The trailer now has close 10,000 miles of use and the problem is the same as the first day.

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Jerry D in NC

08-17-2001 02:58:15




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 Re: Re: Re: Trailer brake vibration in reply to Butch (OH), 08-16-2001 20:13:09  
That is probably a little too heavy. Do you have brakes on both axles? If so then you want to adjust the max brake force to less than locking up. That will give you the most braking power anyhow. If both axles lock up when you really need to get on it then you will see that trailer pass the truck on one side or the other. A dragging rolling wheel provides more friction than a sliding wheel that has lost traction. That is why the inertia brakes pulsate, to keep from locking up. I always adjust mine with each load to put a drag on the truck with the max lever fully engaged. At 20 mph I want it to stop the truck and trailer in about 100-150 feet.

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charlie

08-18-2001 06:41:32




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 Re: Re: Re: Re: Trailer brake vibration in reply to Jerry D in NC, 08-17-2001 02:58:15  
i'd junk the controller from france,go out and get a voyager 9050 and be done with the whole problem.check ebay.good luck



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Butch

08-17-2001 05:11:52




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 Re: Re: Re: Re: Trailer brake vibration in reply to Jerry D in NC, 08-17-2001 02:58:15  
Thanks Jerry, I'll give it a try this weekend. Yes I have brakes on both axles. I know that I went a little overboard with the brakes but the front of my pickup isn't flat, like a couple of my buddies are. It amazes me how many people are dragging around heavy trailers with little, to no brakeing.



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Jerry D in NC

08-17-2001 06:37:52




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 Re: Re: Re: Re: Re: Trailer brake vibration in reply to Butch, 08-17-2001 05:11:52  
Yeah after pulling some real loads for a while you start looking at some rigs and just let them go on a get away from you because you know they ain't got enough vehicle to stop it and they have a 4 prong plug for lights. Some of these Yuppy Jeeps that are hooked to a boat that is twice the weight of the vehicle scare me the most.

You MUST be VERY careful that you do not set your trailer brakes tight enough to lock up because you will jack knife that trailer around your truck and get hurt. Rolling tires have static friction keeping them from moving side to side but sliding tires have no resistance in any direction. If you are going around a curve or get slightly off straight, such as you would be dodging something then the force will push that trailer right on past you. I typically only want brakes on the front axle of a trailer so one axle is always rolling and the other one can't break free.

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