RE: Lanyard for electric brakes

[MtnCamper]

 MattH
Sure, In theory it would work, but the power required to compress the springs 100% of the time you are traveling, would probably burn up your battery, and alternator.
 
 Wouldn t it be easier to just buy a battery?

[jackgoesthepopup]

 MattH
Yeah you are properly right. Just an idea . You never know until you you talk about something.  Thanks guys

[tlhdoc]

 MattH
I would hate to have to hook a battery up just to move the PU by hand in the driveway.

[AustinBoston]

 jackgoesthepopup

ORIGINAL:  jackgoesthepopup
 
 I know know that the battery is used to apply the brakes in case of a brakaway. But my point is if you had the brakes set up so that voltage was used to keep the brakes from applying. All a electric brake controller is a varitable resister . As you apply your brakes on The TV you also send an increasing amout of voltage to make the brakes apply on the trailer. What i am saying is do it in reverse. Have the brakes fully imployed buy springs and have the controler ativate a selinold that  over comes the power of the springs. As you apply your brakes on the Tv voltage that is sent to the selonid is decreased letting the springs apply the Brakes.  In case of a brake away no voltage in there to keep the springs from apppying so the springs apply the brakes. full force. Maybe i am not being clear enough or not saying it right.
 

 The problem with this idea is that most of the braking power doesn t really come from the electric current supplied.  It comes from the motion of the brake drums.  The magnet is on an armature that grips the drums.  The motion of the drums moves the armature, and that is what actually applies the brakes.  Most of the power is supplied by momentum.
 
 This actually brings up an unimportant factoid.  A trailer at rest on a level surface has no brakes, even if power is applied.  Get it to roll a few inches and the brakes will come on, but without the movement, nothing much happens.
 
 Austin