I have two 580ks and wanted to share a fix I do with the actuators. I found that the reason you lose hyd. oil in the brake system is usually cause by pitting in the actuator cylinder. The price for one is crazy $500+. To fix the pitting problem I solder the rod than file smooth. The shaft is again smooth no leaks no cost and is permanent. A little tricky until you get the heat just right and for you old guys it like leading in your car. My 2cents
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