Another what is this.

Has to do with the bumpy conditions on dirt .

 

Typically, engaged (on) means the ABS is overridden (off)... makes perfect sense.

Sometimes there is (also) a switch for traction control (which also uses the ABS system) and it needs to be engaged so the system is off.

 

Was 7 years ago had that truck so hard to remember. How many have you drove ????

 

Dad had them in all his trucks. He told me the reason is that if the ABS system detects a wheel starting to lock up while on the jake, the jake will shut off. Last thing you want when you're trying to guide 100k+ lbs down the side of the mountain. At least if you're paying attention you can react rather than just suddenly dealing with no jake holding you back. Don't know if its true or not. Just what he told me years ago when I asked him what that switch was for. Suppose another reason being that ABS is less effective on loose gravel when trying to stop.

 

A half-dozen or so.

 

Yes, kills the jake so you don't kill the engine... which would be a bit worse.

It's what happens when trucks are smarter than some drivers... they have to design to the lowest common denominator.

 

New truck has an ISX? The throttle pedal on those is wayyyy too sensitive IMO. I seem to recall the dealer can change the governor settings and can make it less sensitive. Still more sensitive than a CAT though.

 

I can see that happening with full lockers engaged. Just one corner locking up shouldn't stall the engine though.