Low pressure warning: switchRecall 79V-253 · 1973–1978 Hendrickson Hendrickson
HENDRICKSON MFG. CO. recall 79V-253 covers 1,246 1973–1978 Hendrickson Hendrickson for a low pressure warning: switch problem, reported to NHTSA on November 15, 1979.
Source: NHTSA recall 79V253000 and manufacturer quarterly reports. Started by NHTSA (compliance).
The problem
THE LOW AIR PRESSURE SWITCHES USED ON SOME OF THE INVOLVED VEHICLES HAVE A MANUFACTURING TOLERANCE THAT ISSUES A WARNING ONLY WHEN THE PRESSURE DROPS A FEW POUNDS PER SQUARE INCH BELOW 60 PSI. AS A RESULT, THEY DO NOT COMPLY WITH FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS".
The fix
IF THE OWNER, UPON RECEIPT OF A POST CARD, INDICATES A COMPLIANCE, THE DEALER WILL REIMBURSE OWNER $5.00 FOR COST OF TEST. IF OWNER INDICATES A NON-COMPLIANCE, THE DEALER WILL SEND TWO REPLACEMENT SWITCHES AND A CHECK FOR $5.00 TO COVER BOTH THE SYSTEM TEST AND SWITCH REPLACEMENT.
VEHICLE DESCRIPTION: TRUCKS, DRILL RIGS, CRANE CARRIERS, AND SCHOOL BUSES.SYSTEM: SERVICE BRAKES; AIR PRESSURE WARNING SWITCHES.CONSEQUENCES OF DEFECT: IF THE LOW AIR PRESSURE WARNING SWITCH IS NOT ACTIVATEDAT PRECISELY 60 PSI, THE DRIVER WOULD NOT BE FOREWARNED OF POTENTIAL LOSS OFBRAKING ACTION. THIS COULD CONTRIBUTE TO A VEHICLE ACCIDENT.
Recall repairs are free. Confirm whether this recall is open on your vehicle by entering its VIN at nhtsa.gov/recalls.