How long can typical elec. trailer brakes take full 12v - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 09-12-2007, 12:51 PM   #1 (permalink)
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How long can typical elec. trailer brakes take full 12v

There are times when manuevering heavy truck trailer combos that it would be nice to be able to lock the trailer brakes with a full 12V. For instance pointing up a steep hill and parking for a moment to get out to look where I'm backing up... Truck parking brakes often work very poorly in reverse so it would be nice to be able to get out and chock the wheels. Sometimes it is close to impossible to even get out of the truck because of the need to be on the brake pedal.

Anybody know how long a full 12v can be applied to the trailer brakes before they burn up?
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Old 09-12-2007, 01:23 PM   #2 (permalink)
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I don't think electric trailer brakes offer any substaintial braking when the trailer wheels are turning backwards. When rolling forward, the magnet drags on the drum forcing the brake apply lever outward to engage the shoes. When rolling backward, the brake apply lever would be pulled inward (if it will even move that direction at all) which would tend to disengage the shoes.
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Old 09-12-2007, 02:01 PM   #3 (permalink)
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Now I recall that that is the way they work - thanks.

I would still like to know how long you can lock them up without burning up the magnet goint forward....
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Old 09-12-2007, 03:35 PM   #4 (permalink)
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Can't help on the magnet thing, but for the reverse thing, I have *heard* that if you put one of the brake sets on 'backwards', you might get the braking power you want in reverse.

Sure, it would limit your forward braking a bit (say instead of 4 forward brakes, you might now have the equivalent of 3 (2 at full power, and 2 and say 1/2 power).

Just a thought, I have no idea if its a good idea or not. Although for a static load (stopped) with full power applied, I would expect that even the 'limited' braking would probably be enough to hold the trailer when combined with the truck's e/parking brake.

A call to say Dexter or something might get you the best answer on the 12V thing.
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Old 09-13-2007, 04:54 PM   #5 (permalink)
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When we are testing brakes we may have a full 12volts running to them for a few hours depending on what we are doing here in the shop. I've never had a magnet die from having them hooked to a full 12volts.

They can/do work in reverse, just not as well, but it would offer some help. I mean, you aren't talking about them doing all the braking, just helping. You could set up a 12volt hot wire with a toggle switch that went to the brake wire running to the plug on the truck. You could use a diode if you were worried about back feeding the toggle when it was off.
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Old 09-14-2007, 01:10 AM   #6 (permalink)
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Would it hurt the controller any to do that, or should there be a diode for the controller also?
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Old 09-14-2007, 11:34 AM   #7 (permalink)
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Quote:
Originally Posted by nissancrawler View Post
Would it hurt the controller any to do that, or should there be a diode for the controller also?
The one diode would allow for two in's and only one out, so it works for both the toggle and the brake controller.
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Old 09-14-2007, 11:36 AM   #8 (permalink)
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I was going to throw in, the brakes on mine work in reverse pretty well. :shrug:
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