1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2013 by Navistar, Inc. DECEMBER 2013 Page 1 of 2 NAVISTAR, INC. TMS (TRUCK MATERIAL SPECIFICATION) NUMBER
2、: TMS-9530 TITLE: Brake Proportioning System, Test Method CURRENT REV. NO.: 1312 DATE: December 2013 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: Rev B-1 - August 2001 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION This specification
3、may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine the applicability of regulatory limits prior to use
4、. Change Notice: Added Section 2.1 for CEMS B-50 requirements; added Section 9.0; editorial changes. Reference: File 04 Keywords: Brake Proportioning System 1.0 APPLICATION This specification describes the method to be used for testing the Brake Proportioning System used in certain Tractor applicati
5、ons as specified on the engineering drawing and/or assembly drawing. 2.0 SCOPE This specification describes the general requirements for testing, including the procedure and required performance, as well as and Designation on Drawings. 2.1 Restricted Chemical Substances Effective January 1, 2007, al
6、l product supplied to the requirements of this specification must comply with the requirements of the CEMS B-50 specification. 3.0 REFERENCE DOCUMENTS NAVISTAR CEMS B-50 4.0 GENERAL REQUIREMENTS 4.1 Method Of Test 4.1.1 General Performance of this test requires two persons, one person stationed in t
7、he drivers seat of the tractor, and one person stationed so as to observe the operation of the rear brake slack adjusters. 4.1.2 Procedure 4.1.2.1 Charge the air brake system to a minimum of 100 psi air pressure. 4.1.2.2 Release the tractor parking brake by pushing in on the yellow (diamond-shaped)
8、control knob. 4.1.2.3 Deactivate the trailer brake control system by pulling out the red (octagonal-shaped) control knob. 4.1.2.4 Apply the brakes by partially depressing the brake pedal (treadle) and hold the pedal in this partially-depressed position. 4.1.2.5 The observer should note the movement
9、(stroke) of the rear slack adjusters and the position of the yoke-pin in the slack adjuster. NUMBER: TMS-9530 TITLE: Brake Proportioning System, Test Method REVISION: 1312 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical
10、 Standards. Suppliers are required to assume all patent liability. 2013 by Navistar, Inc. DECEMBER 2013 Page 2 of 2 4.1.2.6 With the brake pedal in the partially-depressed position, push the red (octagonal-shaped) trailer brake control knob in to activate the trailer brake control system. 4.1.2.7 Th
11、e observer should note a further movement (increased stroke) of the rear slack adjusters and yoke-pin. 4.1.3 Required Performance The rear slack adjusters and yoke-pins should move away from the chamber as a result of the partial brake application in Step #4 and then move further away from the chamb
12、er (longer stroke) after the trailer brake control is applied in Step #6. These two reactions confirm that the rear brakes operate at reduced pressure when the tractor is operating without a trailer (“bob-tail” condition) and operate at full pressure when the tractor is coupled to a trailer. 5.0 QUA
13、LITY (Not applicable to this test method) 6.0 SOURCE APPROVAL AND QUALITY CONTROL (Not Applicable) 7.0 SHIPPING, PACKING AND IDENTIFICATION (Not Applicable) 8.0 DESIGNATION ON DRAWINGS Add note to drawings, as applicable: Test per TMS-9530 9.0 TECHNICAL INFORMATION For further information related to
14、 the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Ave. Melrose Park, IL 60160 E-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/
