Does your exhaust break whistle?

[SkiFreak]

All that being standard, I feel or seem to feel no distinct exhaust brake being applied.

Have you checked that the exhaust brake itself is actually working?
A simple test would be to check the position of the butterfly linkage and then engage the engine warm-up switch and see if the position changes.
Naturally, the engine would need to be cold for the warm-up circuit to function.

 

[kerry]

What year is your truck? I never see a low vacuum light. Sounds to me as if the tech is wrong. You could test it by applying vacuum with a Mity Vac using a long hose while driving to see if you can manually activate the brake. Resistance is noticeable on my truck when the brake activates.

 

[david506th]

2003 Automatic

 

[kerry]

My initial suspicion would be that the vacuum line to the brake is disconnected or has a leak, hence the low vacuum light.

 

[mog]

I get a "low vacuum" orange light come on. I was told by the Fuso service tech that this is normal.

That is not normal.

 

[david506th]

That is not normal.

Thank you all for the responses. I was of the opinion that it was not as well but that is what I get for trusting the techs. I will have to take the truck to Pensacola next time for maintenance as they have a much better reputation online it seems.

 

[unkamonkey]

Comparing to my 1994 FG would be sort of pointless. No whistle in my exhaust brake. What part of AL do you live in? About ten years ago I ended up in Huntsville, towing a trailer with two motorcycles in it behind the FG so we could ride a part of the Trail of Tears route with all of them other nut cases. Just over 65K on the old beast.