A Report on Various Aspects of the Braking Performance of Medium and Heavy Trucks. Prepared in Response to Senate Report 102-148 to Accompany H.R. 2942; Department of Transportation and Related Agencies Appropriations Bill, 1992. Final Report PDF Download
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Author:
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Category :
Languages : en
Pages : 80
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages : 80
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Author: Richard W. Radlinski
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ISBN:
Category :
Languages : en
Pages : 260
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Category : Air-brakes
Languages : en
Pages : 260
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Author:
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ISBN:
Category : Air-brakes
Languages : en
Pages : 260
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Book Description
Author: Richard W. Radlinski
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Category :
Languages : en
Pages : 84
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Author: United States. Interstate Commerce Commission. Bureau of Motor Carriers
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Category :
Languages : en
Pages : 44
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Author: Mark A. Flick
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Category :
Languages : en
Pages : 40
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Author: Mark A. Flick
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Category :
Languages : en
Pages : 220
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Author: United States. Federal Highway Administration. Office of Motor Carriers
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Category : Motor vehicles
Languages : en
Pages :
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This report documents the results of a series of tests in which several different types of performance-based brake testers (PBBTs) were compared side-by-side (i.e. a round robin test) in their ability to accurately measure brake forces (BFs) and wheel loads (WLs) of commercial vehicles (CVs), and to then predict the vehicle deceleration capability for a 32.2 km/hr on-road stopping test. The PBBTs consisted of five roller dynamometers (RD), two flat plate (FP) testers, and one breakaway torque tester (BTT). A PBBT that can also meet a set of functional specifications could be used for law enforcement by safety inspectors once performance-based criteria are codified. In the test program, specific ratios of BF to WL were imposed on both a 5-axle combination tractor semi-trailer and a two-axle straight truck, in both the fully laden and unladen conditions. In each loading condition, the overall vehicle braking capability was set to achieve a proposed minimum requirement of 0.4g, where g is the acceleration due to gravity. In addition, the brakes on specific individual wheels were set to provide a BF/WL of 0.25 and 0.35, for a steer and a non-steer wheel, respectively. The vehicles were also instrumented to record stopping distances and decelerations from on-road stopping tests performed from 32.2 km/hr. In general, nearly all of the PBBTs were able to accurately measure the CVs' brake forces. Only one of the FP-type testers experienced erratic performance during the round robin. In contrast several of the PBBTs had difficulty in reporting the accurate gross vehicle weight. In some cases, particularly with the portable PBBTs the reported wheel loads for axles 2 and 4 (the lead axle on the tandem set) of the 5-axle vehicle were very high, leading to an under-prediction of the vehicle deceleration capability. Calibration checks of the PBBT weighing mechanisms indicated that all could meet the functional specifications. As such, it was concluded that accounting for the redistribution of axle loads due to the vehicle suspension and the geometry of the PBBT ramp would require special test procedures or remote entry of vehicle or axle weights for use in law enforcement. The repeatability of all the PBBTs was good, meeting the acceptability criteria in more than 93 percent of the test cases.
Author: United States. National Transportation Safety Board
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Category : Truck accidents
Languages : en
Pages : 96
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Heavy truck braking performance is affected by the maintenance of the braking system. If parts of the system are inoperative or not functioning properly, system performance deteriorates. Of the 189 cases investigated by the Safety Board, this safety study focuses on 32 cases that involved heavy trucks with brake problems. Of these 32 accidents, one of the most prevalent vehicle-related safety issues that surfaced was out-of-adjustment brakes. The report concludes with recommendations to the National Highway Traffic Safety Administration, the American Trucking Associations, and the National Private Truck Council.
