Quote Originally Posted by Tim1118
If I am wrong, I apologize...

However, I have driven several fire apparatus equipped with Telma Retarders, and they all started to engage when I took my foot off of the accelerator pedal. In fact, in spec'ing a few apparatus, I've been able to specify to what stage it would engage to off of accelerator. Maybe you could shed some light on this?
I'll apologize first.

Found out that they do make an off-throttle system. Not sure when they came out with it, but they do make it.

I stand corrected.

FM1