Reported risk: 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.
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ProductGuru indexes recall and safety-alert records from ~30 public agency registries. We are not lawyers, regulators or product-safety consultants. This page restates what the named agency published; consult the primary source above (or qualified counsel in your jurisdiction) before any commercial, medical or safety decision.