Defect summary
A BRAKE AIR LINE PLUMBING ERROR CAUSES THE SPRING BRAKES TO BE APPLIED WITHOUT BRAKE APPLICATION WHEN THE AIR PRESSURE IN THE PRIMARY TANK DROPS TO A LEVEL WHICH AUTOMATICALLY ACTIVATES THE SPRING BRAKE SYSTEM.
Consequence
ACTIVATION OF THE SPRING BRAKE SYSTEM WITHOUT OPERATORBRAKE APPLICATION WILL CAUSE THE SPRING BRAKE TO BE APPLIED, LOCKING THE BRAKESWITHOUT ANY WARNING TO THE OPERATOR.
Remedy
REPLACE AND REROUTE AIR BRAKE HOSE TO COMPLY WITH FMVSS 121.
Notes
SYSTEM: AIR BRAKES, FMVSS 121.VEHICLE DESCRIPTION:BUSES AND SCHOOL BUSES.
Source: NHTSA ODI recalls file, campaign 92V078000. Text as published by NHTSA.