exhaust brake issue

Another easy electrical check:

Most coaches have a "pre-select" gear when exhaust brake or engine compression brake are activated (not just in "stand by). So, your Allison shift pad will go from "6" to some lower gear-0 with 2 and 4 being common choices.

So, when you are driving, what does the left/only Allison shift pad indicate?

BTW, engine compression brakes are VERY common on the ISL in RV applications. Have exactly that engine in our 2003 Alpine (Cummins ISL, 400 HP, 1,200 lb-ft torque at 1,300 RPM and two stage engine compression brake). A very good power to weight ratio in 38' two slide coach.

If it is an exhaust brake, a PacBrake probably. When was the last time you lubed it? The recommendation is once per year using a special lube.

YC 1 wrote:
Your sig shows an 06 model. You comments say 2002?

A 2006 probably is just as described and may use a variable ratio turbo for the braking.

A 2002 may have a mechanical one and need lubing.

Yc1, Good eye. Its a friends coach.

Thx

Another form of engine braking

This is what is on my engine. It is NOT a compression brake nor is it an exhaust brake as we know it.