NHTSA recall 91E041000 · Equipment
Service brakes, air › Drum › Chamber
The defect
The spring brake units can fail to release from the parking or applied position due to a misalignment between the spring plate and the spring housing. The condition can be either intermittent or permanent.
The risk
The failure to release from the applied position cancause wheel lockup, overheated brakes, increased stopping distances or coulddisable the school bus. This could present an unreasonable safety risk to theoccupants.
The remedy
Replace the spring brake unit.