Mack IS recalling 218 my 2006-2007 mr trucks. A check valve was omitted from the secondary supply port of the SR-7 spring brake modulating valve.
Risk and remedy
Risk
As a result, an air leak in the secondary or primary system may result in the park brakes inadvertently applying, increasing the risk of a crash.
Remedy
Dealers will add a check valve to the secondary supply port of the SR-7 spring brake modulating valve and will also repair the SR-7 valve by applying a check valve repair kit as required for the bendix safety recall (please see 07e-037). the recall began on april 15, 2008. owners may contact mack at 1-800-528-6586.
On certain trucks equipped with bendix SR-7 spring brake modulating valves, the internal rubber check valve may leak causing a delay in the application of the spring brakes to park the vehicle after the operator pulls the dash valve button.
Risk and remedy
Risk
This could delay or failure in applying the parking brakes which could result in a vehicle roll away, increasing the risk of a crash.
Remedy
Mack IS working with bendix to repair these vehicles (please see 07e037). bendix will install a check valve repair kit for the affected SR-7 spring brake modulating valve free of charge. the recall began on january 10, 2008. owners may contact bendix at 1-440-329-9000 or mack at 1-800-528-6586.
On certain trucks equipped with SR-7 bendix brake valves, the check valve inside the valve cavity may not properly set, causing internal air leakage. if the check valve does not properly seat, the resulting leakage can cause a delay in the application of the spring brakes to park the vehicle after operator pulls the dash valve button.
Risk and remedy
Risk
The delayed parking brake application can occur without warning, leading to unintended vehicle rollaway increasing the risk of a crash.
Remedy
Dealers will inspect the valves and replace it free of charge. the recall began on august 14, 2006. owners may contact mack trucks at 1-800-528-6586.
NHTSA’s Office of Defects Investigation opened these reviews into vehicles including this one.
Air brake system control valves
EA09009Opened Jun 18, 2009Closed Aug 13, 2010
Investigation has not identified a defect.complaints have abated.see closing report for further details.
Air brake control valve
PE09010Opened Feb 13, 2009Closed Jun 18, 2009
Odi IS closing this preliminary evaluation and opening an engineering analysis (ea09-009) to further identify and evaluate the vehicle environment and brake system factors that may be causing or contributing to extended stopping distance perfromance in certain vehicles.
Service bulletins
Technical service bulletins and other communications the manufacturer sent dealers about this vehicle. Ask a dealer for the full document by its number.
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