This video is the amateurism of today of the majority of car mechanics and others to know that for all brake cylinders it is preferable to disassemble even new to add a specific gap if possible with Teflon or graphite which multiplies the lifespan, currently I ride with the rear brake cylinder of the mtw of Charles M that I had replaced because it was seized with 5000KM approximately I only cleaned the rust dust and repolished with very fine scotchbrit the cups had no signs of wear and I also ride with its master cylinder that I cleaned and greased for several years, when I started mechanics in 1976 I already disassembled the new hydraulic cylinders to grease them because there were already problems of lifespan, life span often linked to assembly in a humid atmosphere and lubricant which resembles a light oil which may even be missing.
