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Old 12-24-2004, 02:55 PM   #1
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If it gets pulled out the brakes lock? Or will they stop at the pre-set setting? Does it have to be replaced if the cable gets pulled out...? New to this...never had it happen but AM wondering....
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Old 12-24-2004, 02:55 PM   #2
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If it gets pulled out the brakes lock? Or will they stop at the pre-set setting? Does it have to be replaced if the cable gets pulled out...? New to this...never had it happen but AM wondering....
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Old 12-24-2004, 07:18 PM   #3
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If pulled out it will lock the brakes on the trailer! Of course it will be hardly noticible with the F350! You will just see a lot of smoke in the rear view mirrors!
I was doing a u-turn and the cable got caught under the hitch and pulled the pin. Trailer wheels locked and the truck just towing it down the gravel lot! Left ruts six inches deep! Got out and re-positioned the cable, and plugged it back in and all was well.
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Old 12-24-2004, 08:20 PM   #4
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Once the cable is pulled the brakes lock right up. No, you don't have to replace it, the pin or cable that is. Depending on the distance travelled or terrain you have deceided to use your trailer as a tractor weight sled pull, you may want to look things over a little. Flatened edge tires, check hitch device and eveidence of brake pads being overheated and maybe over worn. I've had it happen twice that I came off an interstate and the darn cable wrapped around my fiver hitch slider lever so that the first serious 90 degree turn (such a sharp turn ment slowing down to a mere 5 mph thank god) the cable pin popped and brought me to a grinding halt. Once it happen while backing into a site and they locked up and I though I had hit a tree top or something that wasn't letting me reverse. I can tell you it was not fun creeping around the rig to see what was holding me up, whew...just the cable pulled. Good luck and welcome aboard and Merry Christmas
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Old 12-24-2004, 11:35 PM   #5
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The emergency system is really very simple. It is nothing more than a switch hooked between the trailer battery and the brakes. When the cable is pulled, the switch turns on and sends full battery voltage to the trailer brakes.

The trailer brakes will do all they can do with full power to them. They may lock up the tires, or not, depending on how well your trailer brakes work. If the brakes are inadequate, covered with leaked axle grease, worn or out of adjustment, they might not completely lock the wheel. My brakes will not lock the wheels fully, even at full output. They are brand new, broken in and adjusted correctly. They will come so close to locking that the tires will end up smoking (literally... I thought they were going to burst into flames) after a downhill panic stop. That's close enough for me.
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Old 12-25-2004, 10:32 AM   #6
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Thanks for the input....i was just curious....ussually try to check out emergency stuff before i need to use it and was wondering if i did could i put it back together....thanks again and Merry Christmas!
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Old 01-01-2005, 06:57 PM   #7
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Some brands of electric brake controllers display a warning in the owner's manual that says something like this: "The operation of the breakaway switch may damage the controller. Have the controller checked by a qualified service center prior to reuse." I have had to replace one controller from breakaway switch activation. It still worked, just would no longer apply as much braking voltage to the trailer as I liked.
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Old 01-02-2005, 06:54 PM   #8
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Ya beat me to it RAY,

Everyone should be aware that the "break-a-Way" switch should NEVER be used to test the trailer brakes while the trailer is plugged in to the truck.

Some folks will pull ahead slowly while another person jerks the pin to see if the trailer brakes will stop the trailer..

This is a BIG NO-NO !! every brand of electric brake controller has a warning in the instructions that say never pull the "break-a-Way" pin out while power cable is connected to the tow vehicle..

The reason is that when the pin is pulled it allows the current to flow from the trailer's braking battery to the brakes like Ray says ...

AND ... the current flows back to the controller in the tow vehicle..... ZAP !! goodbye brake controller

Happy New Year everyone,
John
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Old 01-07-2005, 04:00 AM   #9
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It won't hurt anything to pull the pin if the trailer battery is not in backward. If the trailer battery is in backward that puts it and the truck battery in series which will put twice the voltage (24v) to the controller. That is enough to fry it. If the trailer battery is not in backward the two batteries will be in parallel, and the voltage will remain 12v.

William
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Old 04-17-2005, 09:19 PM   #10
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One other thing to be aware of regarding the emergency brake cable: If the emergency brakes are set for an extended period of time, the extreme current will drain your batteries, and could ruin your brakes.

Brake magnets have been known to overheat to the point of destroying themselves with the full battery voltage applied for an extended time.

No, I do not know how long an "extended time" is, but if your emergency brake cable is pulled, don't allow it to stay that way any longer than necessary.

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Old 04-18-2005, 04:45 AM   #11
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Wheaton:
It won't hurt anything to pull the pin if the trailer battery is not in backward. </div></BLOCKQUOTE>The problem is that, if the breakaway pin is pulled, the brake controller is being back-emf'ed with +12VDC through the controller's trailer brake output wire. If the controller isn't designed to take this back-emf situation (i.e., a diode in the brake output to prevent reverse current flow), it can be fried. It's happened to a number of individuals right here on iRV2.com as well as other forums.

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