Brake Surface Grease Contamination

What NHTSA is examining

The Office of Defects Investigation (ODI) opened this investigation based on 8 Vehicle Owner Questionnaires (VOQ) alleging grease contamination on the trailer brake shoes or drums.This condition could potentially increase the towing vehicle's stopping distance and therefore increase the risk of a crash.During the investigation, ODI received 2 additional VOQs alleging the same problem.ODI sent Information Request letters to Forest River and the component supplier, Lippert Components, Inc. (LCI).In response, each provided complaint and warranty information for the subject & peer vehicles and components respectively.ODI visited multiple Recreational Vehicle (RV) dealers to survey their pre-delivery and maintenance inspections.In addition to local dealerships, ODI visited the Columbus, Forest River and LCI axle plants.ODI observed the hub assembly process at LCI and noted that the hub and bearings are assembled at a subassembly station and greased before transferring them to the main line for assembly on the axle.This allows for grease to escape the seal before ever being assembled.If the grease is not completely removed by the employee just prior to assembly, it may remain on the braking surface. A thorough review of the available data revealed one crash.The crash was minor and although an injury was reported, ODI was not able to confirm as no police report had been generated.ODI attempted to interview both parties; however, the subject vehicle owner was the only respondent.At…

Vehicles under investigation