Office of Highway Safety Motorcoach Braking Jennifer L. Morrison.

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Presentation transcript:

Office of Highway Safety Motorcoach Braking Jennifer L. Morrison

1993 MCI DL-3 Motorcoach Steer DriveTag

Brake Adjustment Brake Chamber Type Automatic Slack Adjuster Length

Brake Adjustment, Cont’d. AxlePush Rod Travel (inches) Adjustment Limit (inches) Left steer 1 1/21 3/4 Right steer 1 3/4 Left drive 2 7/82 1/4 Right drive 2 3/42 1/4 Left tag 1 3/4 Right tag 1 5/81 3/4

Maintenance Out-of-adjustment automatic slack adjusters Play in the foundation brakes July 2005 inspection – 3 motorcoaches placed out of service – Including the accident motorcoach Out-of-adjustment drive axle brakes Chippewa Trails was unaware of proper automatic slack adjuster maintenance

NTSB Recommendations Since this accident: – Recommendations from Glen Rock, PA 2-fatality dump truck accident – To the FMCSA and CVSA H-06-1 Open–Acceptable Response H-06-7 Open–Initial Response Received Progress is being made CVSA article

Effects of Out-of-Adjustment Brakes Real Condition of the Accident Motorcoach Ideal Conditions Pre-Impact Deceleration Braking Efficiency 54%85% Distance for a Complete Stop (from 70 mph) 442 feet278 feet