Issue
Hazard description
On certain vehicles, inconsistent actuation of the park brake relay valve may cause delayed park brake application. At higher vehicle loads, a bus may roll if the driver releases the service brakes before the parking brakes fully apply. A moving bus may cause a vehicle crash or injure passengers entering or leaving the bus. Correction: Dealers will install a check valve to reduce the park brake application time by adding an exhaust path around the relay valve.
Vehicle
THOMAS BUILT C2 SCHOOL BUS
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