SAE J1953:2018 free download.Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators.
RATIONALE
This revision updates references from SAE J1817 to the newer standard SAE J2899 which is now the recognized source for brake inspection limits. This revision also brings nomenclature in line with SAE J2899.
1. SCOPE
This SAE Recommended Practice shall cover mechanical-brake adjustment limit stroke indicators for actuators with visible exposed pushrods and electrical-brake adjustment limit stroke indicators for all air-brake actuators.
This device shall indicate the foundation brake(s) may require adjustment or service when inspected per vehicle manufacturer’s procedures. A measurement shall be made to determine actual stroke measurement for any system not factory calibrated.
Stroke indication accuracy of an air-brake actuator can be assured only when all of its components are supplied by the original brake actuator manufacturer.
1.1 Purpose
SAE J1953 establishes design guidelines for air-brake actuator stroke indicators,
2, REFERENCES
2.1 Applicable Documents
The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply.
3.1 Stroke Indicator
Mechanical Design Guidelines.
3.1.1 The stroke indication shall occur at +0 -3.8 mm (+0.00 -0.15 inches) of the recommended brake adjustment limit in Figure 3 of SAE J2899.
3.1.2 The stroke indication shall be high visibility orange to red (see Figure 1).
3.2 Stroke Indicator
Electrical Design Guidelines.
3.2.1 The stroke indication shall occur at +0 -3.8 mm (+0.00 -0.15 inches) of the recommended brake adjustment limit in Figure 3 of SAE J2899.
3.2.2 Electrical system installation shall conform to SAE J1292, ii applicable.
3.2.3 Electrical systems shall have a system function test capacity.
3.2.4 Any system that provides a driver-warning device in a distracting manner shall be provided with manual override which shall automatically reset each time the vehicle is shutdown or restarted.
3.3 Test Procedure
3.3.1 Mechanical Design
Test per SAE J1469.
3.3.2 Electrical Design
Test per SAE J1455.
4. NOTES
4.1 Revision Indicator
A change bar (I) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes. have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are fbi used in original publications, nor in documents that contain editorial changes only.