2015 mack pinnacle automatic

[Tammy]

Been having issues when backing truck with load on an upgrade,  wants to keep stopping/braking on me,  is there sensors?  Been to Mack dealer twice,  they can't figure it out,  was wondering if anyone else was having the same issues?  Any help would be appreciated! 

 

[B-42]

Tammy, 

 I have a 2015 Pinnacle that does the same thing.  Look for a switch on the dash marked "disable".  This will temporarily disable the grade-gripper feature on the M-Drive, allowing you to move the truck without the 2 or 3 second delay before the brakes are released.  It does not have to be much of an incline to activate the grade-gripper and it can be kind of annoying.  I use that override switch constantly.  You can manually toggle the override back off or it will automatically do so once the truck accelerates to 5 or 10 mph.  Hope this helps.