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Tractor Transporting Discussion Forum

Electric brakes

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Mike n Mo

07-11-2011 10:40:37

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My brakes on my gooseneck trailer aren't working as they should. When new(2006) I would set the max voltage (loaded) to about 8 volts and have good braking performance. Now, I'm at 13 volts (at the Teknoshia Prodigy readout) and don't have much braking from the trailer. Voltage at the controller output and truck plug is 11.75 V, and 9.75 V at the brake magnet. Yeah, I know I'm loosing 2 volts, but that's thru a 50' wire. Grounds are good, less than 1 ohm from the trailer frame and truck frame. I inspected/lubed actuating arms, sanded the shoes, and adjusted the brakes so they had a slight drag when spinning the wheel while jacked up. All brakes work while jacked up. Magnets have some wear, but still look ok.

Is the best solution just to replace the assemblies? That's cheaper than buying piece parts. Any advantage between Hayes or Dexter assemblies?

I'm open to ideas. Mike

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charles todd

07-12-2011 19:54:19

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 Re: Electric brakes in reply to Mike n Mo, 07-11-2011 10:40:37  
I agree with souNdguy, bad connections raise the resistance of the circuit, degrading the performance. Hence why I solder and heat shrink ALL trailer connections.


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07-12-2011 11:44:03

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 Re: Electric brakes in reply to Mike n Mo, 07-11-2011 10:40:37  
1 ohm thru 50' or correct size copper and a 2v drop are both too much.

either you have bad connections or really.. undersized wire and or insuficient grounds.

99% of trailer e-brake problems i've seen boil down to that.


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07-12-2011 09:26:56

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 Re: Electric brakes in reply to Mike n Mo, 07-11-2011 10:40:37  
I know you've 50' of wire, but a 2 volt drop is still a lot. Check for some corroded butt connectors or scotchlocks.

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bobs old iron

07-11-2011 22:39:03

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 Re: Electric brakes in reply to Mike n Mo, 07-11-2011 10:40:37  
hayes or dexter, some prefer one to the other, your call....on my goose when i bought it, the brakes would catch/release repeatly to a stop, like anti-lock brakes. found out that a wire at rear brake assembly was not fastened right causing wire to rub and short out brakes.... if you have to replace parts, depending on how old/worn system is, yes it's cheaper to replace axles set-up than a piece at a time, plus you have new brakes for safety also.

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