IMHO

Term used in the railroad industry. Brake, never braking.

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Note added at 51 mins (2015-02-24 16:32:31 GMT)
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ew. non-sparking brake block

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Note added at 10 hrs (2015-02-25 01:45:00 GMT)
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Within the framework of this project an ecological and material-saving technology was developed for producing non-sparking brake blocks with high quality
The presented article is the second in the series, which presents research related to the improvement of technology for producing brake blocks for the railway industry in the Spomel foundry in Lębork.
http://www.prace.iod.krakow.pl/en/prace/2014/3/132/the-ecolo...
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As a direct result of the Roseville explosion, spark shields above railcar wheels and non-sparking brake shoes were required
http://www.globalsecurity.org/military/facility/concord.htm

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Nieiskrzące wstawki hamulcowe z żeliwa fosforowego do pojazdów szynowych
Non-sparking brake shoes made of hosforoidal cast iron for railway vehicles ..
http://yadda.icm.edu.pl/baztech/element/bwmeta1.element.bazt...
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Locomotives should be equipped with the latest designs in spark retention arrestors and non-sparking brake shoes.
http://www.gpo.gov/fdsys/pkg/CZIC-he199-5-c6-c63-1980/xml/CZ...