Pushrod Travel Limits on Brake Chambers

We have been having problems finding what the allowed pushrod travel is on brake chambers for quite awhile now. There are many ways to indicate if we are faced with a L or L3 brake. This creates delays on the officer's inspection because he has to evaluate properly the maximum alllowable pushrod stroke. This also creates unwarranted OOS for the carriers when the only way to discover the actual allowable stroke is by taking the chamber off the vehicle. This also creates problems for the maintenance shops when the only long stroke indication is a washed off sticker. How can they fix it properly when they have a hard time finding out what to replace it with.

I have forwarded a powerpoint presentation to show a couple of examples of what we are faced with at roadside. SAE J1817 is only a Recommended Practice describing a marking system to distinguish long-stroke from standard stroke for service, parking, and combination air-brake actuators. Since it is not a mandatory marking system it does not have to be abided by. Also the marking options are vast in the way they could be interpreted.

I request a proposal for a unique chart for stroke indication as an idea of what we are looking for at roadside. I propose CVSA petitions NHTSA to mandate the way brake chambers should be marked and indicated. The proposed implementation period should be long enough for all to adjust. Is it possible for the brake manufacturers to agree on a standard marking system to for long stroke vs regular stroke chambers. The current options are ineffective over time. The tags fall off and the embossment corrodes to the point that it is no longer readable.