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SAE J1953 2012 Edition, June 1, 2012
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Brake-Stroke Indicator Design Guideline for Cam or Disc Air-Brake Actuators
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AIA/NAS Aerospace Standards
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.


This document establishes design guidelines for air-brake actuator stroke indicators.