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NHTSA Campaign 07V361000

SERVICE BRAKES, AIR:SUPPLY:CHECK VALVE

Issued by MACK TRUCKS, INC · Reported Aug 15, 2007 · 21,847 vehicles affected

What's wrong

ON CERTAIN TRUCKS EQUIPPED WITH PARKER SINGLE CHECK VALVES (SCV) PROVIDED BY BENDIX. THE DEFECT EXISTS IN THE PARKER SCV THAT CONNECTS WITH THE SUPPLY PORT OF THE SR-7 SPRING BRAKE MODULATING VALVE. AFTER PROLONGED USE OF THE PARKER SCV, THE VALVE BODY RETAINER MAY BECOME EXCESSIVELY WORN AND EVENTUALLY BREAK APART. PIECES OF THE PARKER SCV CAN BECOME LODGED INSIDE THE SR-7 SPRING BRAKE MODULATING VALVE, POTENTIALLY CAUSING EITHER LEAKAGE OUT OF THE SR-7 VALVE OR PREVENTING AIR FROM PROPERLY EXHAUSTING FROM THE SR-7 VALVE.

Consequence

THIS CONDITION CAN CAUSE A DELAY IN THE APPLICATION OF THE SPRING BRAKES TO PARK THE VEHICLE AFTER THE OPERATOR PULLS THE DASH VALVE BUTTON. THESE CONDITIONS CAN OCCUR WITHOUT WARNING, LEADING TO UNINTENDED VEHICLE ROLLAWAY, BRAKE DRAG, OR IN THE CASE OF LOSS OF PRIMARY CIRCUIT, INABILITY TO MODULATE THE SPRING BRAKES.

Remedy

MACK IS WORKING WITH BENDIX TO REPLACE THE PARKER SINGLE CHECK VALVE. THE RECALL BEGAN ON JANUARY 9, 2008. OWNERS MAY CONTACT BENDIX AT 1-440-329-9000 OR MACK AT 1-800-528-6586.

Vehicles affected by this recall

Make Model Year Units
MACK CHN 2005 21,847
MACK CHN 2006 21,847
MACK CHN 2007 21,847
MACK CHU 2008 21,847
MACK CTP 2006 21,847
MACK CV 2004 21,847
MACK CV 2005 21,847
MACK CV 2006 21,847
MACK CV 2007 21,847
MACK CV 2008 21,847
MACK CXN 2005 21,847
MACK CXN 2006 21,847
MACK CXN 2007 21,847
MACK CXN 2008 21,847
MACK CXU 2008 21,847
MACK GU 2008 21,847

Source: NHTSA Campaign 07V361000 on nhtsa.gov. To check the current repair status for a specific vehicle, use our free VIN decoder.