Mack Pinnacle (Chu), Pinnacle (Cxu) +4 more: Service brakes — automatic

Affects Mack Pinnacle (Chu), Pinnacle (Cxu), Leu, Granite (Gu), Gu, Mru · 2011–2012 — about 2K vehicles.

The hazard

SLACK ADJUSTERS WITH THIS FLOW NOTCH COULD CRACK UNDER NORMAL BRAKING CONDITIONS CAUSING LOSS OF BRAKING WHICH COULD RESULT IN A VEHICLE CRASH.

What to do

MACK TRUCKS WILL NOTIFY OWNERS AND DEALERS WILL REPLACE THE SUBJECT SLACK ADJUSTERS FREE OF CHARGE. THE SAFETY RECALL BEGAN ON AUGUST 24, 2011. OWNERS MAY CONTACT MACK TRUCKS AT 1-800-528-6586.

Critical — crash/injury risk now High — injury risk; see remedy Moderate — fix at next service Low — minor / informational