Monday, Sep 09, 2013 at 11:51
The other thing to remember is that the brake voltage is not constant, it will be a "pulse width modulated" output (series of pulses of varying width and duty cycle), AND it will vary during the braking cycle....the voltage indicator on the control unit will just be a donkey display, to give a vague indication.
As I say at full 12 volts it should lock the wheels.....and possibly at any speed......at full braking effort the pulses have become wide enough that it will be more or less continuous supply voltage.
If you look at the braking capacity of these systems, it would be a very rare situation that any where near full capacity would be required
When set up properly the tow vehicle continues to provide the primary braking effort.
The cycle works something like this.
You apply the brakes in the tow vehicle, the rig begins to slow, the controller detects this deceleration and adds braking effort in the trailer.
If you continue to increse braking effort in the tow vehicle the controller continues to increase braking effort in the trailer.
As you either maintain braking effort in the tow vehicle or back off, the braking effort in the trailer rapidly decreases.
if braking modestly, by the time you come to a stop all the braking effort is in the tow vehicle.
Braking tactics are very important with these systems to get the most out of them.
it is best to.
Bring on the brakes steadily.....this brings the trailer brakes into play smoothly.
Brake harder earlier, bringing on the effort progressivly rather than lighter and later....this brings on best distributed braking effort across the rig and keeping the trailer brakes in operation.
Then feathering off as you come to rest.
"Braking like you mean it" keeps all the brakes in operation and all making a contribution.
Light braking will keep the trailer brakes off more and work the tow vehicle brakes harder.
Stabbing the brakes will not result in smooth braking and good progression in and out of trailer braking.
cheers
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