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Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators
- Ground Vehicle Standard
- J1953_201206
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Recommended Practice shall cover mechanical- readjust stroke indicators for actuators with visible exposed pushrods and electrical-readjust 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.
Rationale
This standard is being revised as part of the 5 year review process. Most of the revisions are updates to format and wording only. The tolerance for the placement of the stroke indicator band was changed to + 0.0 -3.8 mm (+0 -.15 in) tolerance instead of +0.0 to 3.8 mm (+0 to .15 in). The minus tolerance means the indicator will begin to show from readjust stroke (max.) to 3.8 mm (.15 in) before the readjust stroke is reached. The old tolerance would allow the indicator to begin showing at readjust stroke or up to 3.8 mm (.15 in) after readjust stroke has been reached. The minus tolerance does not reduce the effectiveness of the indicator, but the old plus tolerance may allow for reduced brake effectiveness beyond the stated readjust point.
Recommended Content
| Ground Vehicle Standard | Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators |
| Ground Vehicle Standard | Tests for Signal and Marking Devices Used on Vehicles 2032 mm or More in Overall Width |
Topic
Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 |
Issuing Committee
Truck and Bus Brake Actuator Committee
The Truck and Bus Brake Actuator Committee of the Truck and Bus Brake and Advanced Driver Assistance Systems Steering Committee is responsible for developing, reviewing, and approving recommended practices, standards, and information reports related to air brake actuators and their interfacing as used on trucks, tractor-trailer combinations and buses over 10,000 lbs (4500 Kg) GVWR designed primarily for highway use.
Reference
| Number | Title |
|---|---|
| J1292_201604 | Automobile and Motor Coach Wiring |
| J1455_201703 | Recommended Environmental Practices for Electronic Equipment Design in Heavy-Duty Vehicle Applications |
| J1469_201702 | Air Brake Actuator Test Procedure, Truck-Tractor, Bus, and Trailers |
| J1817_201603 | Long-Stroke Air-Brake Actuator Marking |
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