1、SURFACE VEHICLE RECOMMENDED PRACTICE J1404 NOV2014 Issued 1977-05 Reaffirmed 2014-11 Superseding J1404 MAY2007Service Brake Structural Integrity RequirementsTruck and BusRATIONALE J1404 has been reaffirmed to comply with the SAE five-year review policy. _ SAE Technical Standards Board Rules provide
2、that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.”
3、 SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2014 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retr
4、ieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-4970 (outside USA) Fax: 724-776-0790 Email: Custo
5、merServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/J1404_201411 FOREWORD The requirements in this SAE Recommended Practice represent the accumulation of the best information avai
6、lable from investigation of the brake system performance of new motor vehicles designed for roadway use. 1. SCOPE This SAE Recommended Practice presents requirements for the structural integrity of the brake system of all new trucks, buses, and combinations of vehicles designed for roadway use and f
7、alling into the following classifications: a. Truck and BusOver 4500 kg (10 000 lb) GVWR b. Combination VehiclesTowing vehicle over 4500 kg (10 000 lb) GVWR The requirements are based on data obtained from SAE J294. 1.1 Purpose The purpose of this document is to establish the minimum service brake s
8、ystem requirements with regard to structural integrity. 2. REFERENCES 2.1 Applicable Publication The following publication forms a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1 SAE Publication Available
9、from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. SAE J294 Service Brake Structural Integrity Test ProcedureVehicles Over 4500 kg (10 000 lb) GVWR 3. TEST PROCEDURE The vehicle is to be tested in accorda
10、nce with SAE J294. 4. ACCEPTANCE PERFORMANCE REQUIREMENTS 4.1 Actuation System 4.1.1 On hydraulic braked vehicles, the pedal shall not go to the floor or the limit of travel on any stop on any system check application. 4.1.2 Brake failure warning devices shall not remain on after any stop. 4.1.3 On
11、hydraulic braked vehicles, there shall be no evidence of fluid leakage from the master cylinder, booster, wheel and brake assembly, valves, hose, fittings, or tubing. 4.1.4 On air braked vehicles, with the brakes fully applied and held, the service pressure drop shall not exceed 69 kPa (10 psi) in 3
12、 min with the engine off. 4.1.5 There shall be no distortion of the brake pedal or treadle, master cylinder, actuating valve, or their attachment hardware or brackets so as to prevent continued braking operation. 4.2 Foundation Brakes and Drums/Rotors 4.2.1 When the brakes are released after the las
13、t stop of the test, and the vehicle is moved, all wheels should rotate freely. In this document, the phrase, all wheels should rotate freely, is defined as: The wheels can be manually rotated by one person when the axle is raised. 4.2.2 On check stops there shall be no uncontrollable braking action
14、causing any tire of a vehicle to leave a 3.7 m (12 ft) wide roadway lane. 4.2.3 On check stops no wheel shall lock. 4.2.4 There shall be no permanent distortion of foundation brake components, drum/rotors, or their attachment hardware or relative movement between the brake assembly and the axle flan
15、ge so as to prevent continued braking operation. 5. NOTES 5.1 Marginal Indicia The change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions have been made to the previous issue of the report. An (R) symbol to the left of the document title indicates a complete revision of the report. PREPARED BY THE SAE TRUCK AND BUS FOUNDATION BRAKE SUBCOMMITTEE OF THE SAE TRUCK AND BUS BRAKE COMMITTEE SAE INTERNATIONAL J1404 Reaffirmed NOV2014 Page 2 of 2_
