The burnishing issue Nike Blazer aaow

The burnishing issue
DON MILLS, Ont. - It's easy to assume that a truck's brakes are never safer or more in compliance than when the truck is brand new, or immediately after a brake job. Invariably,[link widoczny dla zalogowanych], high spots on either surface will mean the new components do not make a perfect contact the arc of the shoe. A wear-in period,[link widoczny dla zalogowanych], or burnishing,[link widoczny dla zalogowanych], has to take place before the imperfections are worked out so the components can perfectly meet. And until the brakes are properly burnished, there is the potential for brake performance and compliance problems."What happens is, if you pull your slack adjusters by hand to get your brake adjustment,[link widoczny dla zalogowanych], you would probably be within the proper tolerances," said Kevin Berry,[link widoczny dla zalogowanych], maintenance manager for Harmac Transportation of Concord,[link widoczny dla zalogowanych], Ont. "But when you do a 90 psi brake application, like (an inspector) calls for, only parts of the shoe will touch the drum. "We don't use very many rebuilt shoes because sometimes the tables are crooked or sometimes the tables are bent."If you are sure of the brake components you are using, the next thing is to make sure you take the necessary time before the truck hits the road to minimize the problems that can potentially be caused by new brakes. "We jack the wheels up and adjust to the closest possible tolerance, then we will run the vehicle around the yard and do brake applications and try to get the measurement in as close as possible," Berry said. "We try and do 15 or 20 brake applications around the yard. If you can get it out on the highway and do brake applications, it will run them in better and faster."Frank Haselden, vice-president of maintenance and compliance for TST Overland Express,[link widoczny dla zalogowanych], echoes Berry's recommendations. That will affect the overall effectiveness of the braking system because it throws the foundation brake components out of balance. The mechanic installing the new brake parts will find out if they are well matched pretty quickly when they do the 90 psi brake application."If it strokes fine,[link widoczny dla zalogowanych], then we let it go,[link widoczny dla zalogowanych]," Berry said. "But if there is any problem with the stroke,[link widoczny dla zalogowanych], then we try to burnish them in."Regardless of the quality of the brake job,[link widoczny dla zalogowanych], it is ultimately up to the driver, in the pre-trip inspection, to decide whether or not the brakes are in proper adjustment. It is important then,[link widoczny dla zalogowanych], Haselden said, that drivers know if the vehicle's brakes are burnished or not,[link widoczny dla zalogowanych], and of the problems that could occur during the brake burnishing period."Drivers have enough to think about,[link widoczny dla zalogowanych], and the biggest thing is knowing they have the best brakes possible," Haselden said. In fact, drivers should pay even more attention to their brakes and wheels until the new components are properly run-in. n
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