Five years have now passed, and Transport Canada wished to assess the effect of the regulatory change on the state of brake adjustment on vehicles with airbrakes. Transport Canada amended Canadian Motor Vehicle Safety Standard 121 to introduce this requirement for vehicles built from. Ontario introduced this requirement for certain vehicles with the same effective date, and extended it to all vehicles from 30 April 1995. Federal Motor Vehicle Safety Standard 121 was amended to require automatic slack adjusters, and a simple visual means of checking brake stroke, on vehicles built from 20 October 1994. A vehicle with some airbrakes out of adjustment may not have a consistent and reliable capability to stop, so a requirement for automatic slack adjusters was introduced to improve the reliability of airbrake stroke. CVSA inspections conducted at random over the last ten years or so have consistently resulted in 25 to 45% of all vehicles inspected being put out-of-service. Airbrake defects have been the principal reason for vehicles to be put out-of-service, and airbrake pushrod stroke in excess of the prescribed limit has been the principal airbrake defect. A vehicle may be put out-of-service if it has any of many specified defects defined by objective inspection criteria. Centre for Surface Transportation TechnologyĪll provinces and states across North America inspect heavy vehicles following standard procedures agreed under the auspices of the Commercial Vehicle Safety Alliance (CVSA).
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