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I have a very similar setup with my 01 with 79,000 on it - it has a Western Diesel (out of business now) exhaust brake on it with the on-off switch and what I have found in some research and experience is pretty simple.
If yours works the same way mine does (uses the stock EBPV as an exhaust brake when activated) then the original instructions said I could use mine all the time - and this would save on brakes. It did this by monitoring the throttle input and when the throttle was set to idle (as in deceleration), it would activate the braking. The problem with this is when using cruise control, the throttle input is not used since your foot is not actually moving the pedal and thus, when using cruise, the system must be turned off or it would activate when you didn't want it. I normally run mine off.
I *do* use it when I am towing and preventing the whole thing from speeding up on long mountain grades - I coast to reduce exhaust temps, my foot is obviously off the throttle so they do not go back up, and I activate the brake if necessary.
So yes, I agree with the posts above - Flip to on before starting the grade and keep an eye on the temps and you should be fine.
Nice setup btw.
01 F350 Dually 4x2 Long 7.3 - Manual
06 Mustang GT - GCC spec (Infidels May be closer than they appear)
13 Elantra - Gas saver
Last edited by Arizona_SVO; 01-25-2013 at 01:08 PM.