RV Roamer said:I have no idea what "2 stage means either.
RV Roamer said:Note that he doesn't actually have a Jacobs brand brake and is using the term "jake brake" generically. The Cummins ISL 400 has an optional 2 stage compression brake from Cummins and may have its own variety of controls and operating procedures. I have no idea what "2 stage means either.
Anybody out there have an ISL 400 with the brake option?
The High position utilizes all 6 engine cylinders in the compression braking, the Low position only uses 3.
Tom said:Even if you can find it easily, I cannot imagine switching the rocker switch on and off continuously, which is what the foor pedal is designed for. I'm not talking about occasional switching, but pressing it on and off several times as required on the same long grade. I'd rather keep two hands on the wheel - much safer.
Tom said:Even if you can find it easily, I cannot imagine switching the rocker switch on and off continuously, which is what the floor pedal is designed for. I'm not talking about occasional switching, but pressing it on and off several times as required on the same long grade. I'd rather keep two hands on the wheel - much safer.
Phil said:Tom,
There is no need to switch the Pac Brake off on a long down grade.? Just apply a slight pressure to the accelerator and the Pac Brake will slack off a little.? Or, leave the cruise control on and let the computers do all the work.? The parameters for the interaction of the cruise control and the Pac Brake can be set to your preference with software available from Cummins.
Phil
Tom said:There is a noticable difference between the two methods of applying the Pac Brake. On our coach, leaving the the rocker switch on, the only time the Pac Brake will come on is at zero accelerator position and it shuts off with depressing the gas pedal. The result, when combined with the down/upshifting, can be a bit lumpy.