Technical Service Bulletin RCB-003-15 — 2011 HINO NE8J

If the parking brake is not released in accordance with the instructions in the Driver?s/Owner?s Manual (such as releasing the parking brake lever only by pushing the lever release button, without holding the lever with the hand, until it is completely released), the tension of the brake cable could be released quickly, causing an increase in the friction between the long hole in the slide area and the cable joining pin. In addition, improper adjustment of the parking brake cable that is stretched due to repeated operation of the parking brake could increase the contact force between the cable joining pin and the long hole in the slide area of the parking brake lever during the operation of the parking brake. If the parking brake continues to be operated in such a condition, the long hole in the slide area of the parking brake lever becomes worn and the long hole diameter becomes enlarged. If that condition occurs, the washer fixed to the cable joining pin can become stuck in the worn and enlarged long hole when the parking brake lever is pulled. This situation may prevent the parking brake lever being pulled to its full stroke, leading to the application of insufficient brake force. In the worst case situation, vibration can cause the washer which is stuck in the worn and enlarged long hole to come off, releasing the parking brake lever and resulting in the vehicle moving.